Shelburne hinesburg road safety study compiled

SHELBURNE-HINESBURG ROAD SAFETY STUDY TCE# 2012005-1 SHELBURNE, VERMONT Date: January 9, 2013

Prepared For: Town of Shelburne

Prepared By:

478 BLAIR PARK ROAD, WILLISTON, VT 05495 | 802 879 6331 | WWW.TCEVT.COM

Shelburne-Hinesburg Road Safety Study Shelburne, VT

Purpose and Need Statement The purpose of this study is to provide the Town of Shelburne with an inventory of existing roadway conditions, safety issues, and to provide a list of suggested roadway improvements for both short and long range planning along with approximate costs for budgeting purposes. Shelburne-Hinesburg Road has a history of crashes due to instances of excessive speeds and limited visibility on curves. Champlain Valley Union High School and Vermont Route 116 is located approximately 3 miles to the west of the Shelburne Town Line in Hinesburg, which makes this a popular route for school traffic and inexperienced drivers as well as a popular east-west commuter route.

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Shelburne-Hinesburg Road Safety Study Shelburne, VT 1.0 Introduction The overall study area encompasses an approximately 3.8 mile stretch of roadway known as Shelburne-Hinesburg Road within the limits of the Town of Shelburne (0.9 miles), and Shelburne Falls Road within the limits of Hinesburg (2.9 miles). This report will focus on the 0.9 mile road section located in Shelburne. A topographic survey as well as a safety audit was conducted to identify the locations and type of potential hazards. Immediate action items are recommended, including striped intersection realignment, improved signage and tree clearing, as well as longer term solutions such as guardrail and bank re-grading.

2.0 Existing Conditions Shelburne-Hinesburg Road is considered a Class 2 Town Highway. The Agency of Transportation (VTrans) identifies the road as having an Urban Minor Arterial functional classification, federal aid number FAU 5715.

According to VTrans automatic traffic recorder (ATR) station S6D33 located 0.5 mi west of Boutin Road in Hinesburg, annual average daily traffic (AADT) on this stretch of roadway was approximately 2400 vehicles per day (vpd) in 2011. Overall, traffic has not increased significantly on this section of roadway over the past 10 years.

Year 2003 2005 2007

AADT 2600 vpd 2300 vpd 2700 vpd

2009 2011

2200 vpd 2400 vpd

A. Route Survey A 3.8 mile centerline survey was conducted in May of 2012, beginning on the west end of the road in Shelburne at the intersection with Dorset Street (Station 0+00) and ending in Hinesburg to the east of the Pleasant View Lane intersection near VT 116 (Sta. 200+00) to determine roadway geometry. A visual safety inventory was conducted in September of 2012 to observe potential hazards and areas for improvement.

B. Speed Data A sign inventory of Shelburne-Hinesburg Road within the study area does not indicate a posted speed limit in the eastbound direction from Dorset Street to the Hinesburg Town Line, and in the westbound direction from the Hinesburg Town Line to the Dorset Street Extension curve, indicating that the default speed limit is 50 mph, per state statute.

There is a speed limit of 45 miles per hour (mph) posted in Hinesburg in both the eastbound and westbound direction. In November 2012, the Shelburne Police

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Shelburne-Hinesburg Road Safety Study Shelburne, VT Department conducted a speed study on Shelburne-Hinesburg Road. According to the data collected, the 85th percentile speed is 50.4 miles per hour (mph) along this stretch of roadway where the study was conducted. Dorset Street to the north is posted at 35 miles per hour, and a majority of other Class 2 roads in Shelburne are posted at 35 mph, as shown in the attached Speed Limit Map. The Dorset Street Curve at Shelburne-Hinesburg Road is posted 25 mph.

Taking into account the existing operating speeds, posted speed limit on adjacent roadways, existing safety issues, presence of inexperienced drivers (school route) and the posted speed limits of similarly classed Town highways; it is recommended that the speed limit be posted at 45 mph on this section of roadway, with the exception of the curve at Summerfield Road noted above.

C. Crash Data The most recent General Yearly Summaries from the AOT Highway Research Department were reviewed to determine crash frequency on Shelburne-Hinesburg Road. Per the AOT Route Log, mile mark 0.0 is at the Shelburne-Hinesburg Town Line and mile mark 0.91 is the Dorset St. Extension. The crash rate was calculated as 1.571 crashes per million vehicle miles for the 0.91 mile stretch of roadway. The Statewide average crash rate for roads in the same classification is 3.4 crashes per million vehicle miles. Crashes are concentrated near the curve at the Dorset St. Extension and the curve near the Summerfield Road intersection.

Date 08/04/2009 11/29/2009 12/09/2009 12/24/2011

Location mm 0.91 mm 0.91 mm 0.2 mm 0.29

09/24/2011 05/06/2012

mm 0.29 mm 0.2

Circumstance No improper driving Failed to yield ROW Driving too fast for conditions Driving too fast for conditions/ Under the influence Visibility obstructed no information given

Direction of Crash Single Vehicle Crash Single Vehicle Crash Opposite Direction Sideswipe no information given no information given Single Vehicle Crash

3.0 Recommended Improvements: Specific Areas A. Dorset Street/Shelburne-Hinesburg Road intersection – mile mark 0.91 Problem: As shown in the photographs below, this intersection is a large expanse of pavement and relatively undefined. This can cause driver confusion, especially for vehicles entering or exiting Dorset Street to the south.

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Shelburne-Hinesburg Road Safety Study Shelburne, VT

Figure 1: Shelburne-Hinesburg Road toward North (Dorset St)

Figure 2: Shelburne-Hinesburg Road toward South/East

Figure 3: Toward Dorset Street (South)

Immediate Actions: A realignment pilot project is recommended as an immediate action that can be taken to improve the safety and operation of the intersection. The intersection should be re-configured as a T intersection, with the southern Dorset Street approach being as close to 90 degrees as possible with the beginning of ShelburneHinesburg Road and Dorset Street (north). Stop control would be on the southern approach of Dorset Street. The curve is currently posted at 25mph. A speed limit sign should be installed with a posted speed of 45 mph in the eastbound direction to the east of the curve. Also, pavement striping (fog lines) and reflective safety posts should be installed to better demarcate the roadway alignment. See attached preliminary design.

Short to Mid-Term: Should the realignment pilot project above be deemed a success after one year of operation, pavement removal is recommended for further permanent definition of the intersection. Remove pavement that is unnecessary for

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Shelburne-Hinesburg Road Safety Study Shelburne, VT vehicular travel and plant with grasses and other native vegetation. These areas should be maintained periodically by mowing to maintain sight distances.

B. Horizontal Curve near Summerfield Road – mile mark 0.29 Problem: Poor sight distance coupled with excessive speeds around the curve create an unsafe condition at Summerfield Road.

A Safe Curve Speed Study was conducted on the curve near the intersection of Shelburne-Hinesburg Road and Summerfield Road in August of 2009. According to the Manual on Uniform Traffic Studies, Chapter 11 Safe Curve Speed Study the speed limit of 50 mph is too great for this curve. At a speed of even 45mph the inclinometer climbed to 20 degrees, which is twice as much as the recommended safe value. The recommended speed for the curve is 35 mph. A field report from this study is attached.

Figure 4: From Summerfield Road toward East

Figure 5: From Summerfield Road toward West

Figure 6: View toward East from Left-Turn onto Summerfield Rd

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Shelburne-Hinesburg Road Safety Study Shelburne, VT Immediate Action: Place advisory speed plaque – 35 mph- on the existing curve signs at both the eastbound and westbound approach to the curve. Add flashing beacon on curve signs. Maintain tree branches yearly by trimming.

Short-Term Action: Place radar speed indicator on advisory speed plaque if observation does not indicate that flashing beacon and advisory speed plaque is ineffective.

Mid to Long Term: Grade slope along south side of road to improve sight distance around the curve. This would involve removing ledge. A preliminary plan is attached showing the limits of grading that would be required to provide adequate horizontal sight distance around the curve.

Other Design Considerations: These recommendations will improve sight distance for the horizontal curve as well as intersection sight distances between Summerfield Road and Shelburne-Hinesburg Road vehicles. Other considerations for site modifications were considered and analyzed for feasibility. These include design criteria for Traveled Way Widening, Derived Pavement Widths for Turning Roadways, Superelevation, and Decision Sight Distance and were excluded because the recommendations would be cost prohibitive.

C.

Guardrail, beginning mile mark 0.15

Problem: Steep side slopes are present at various intervals along Shelburne-Hinesburg Road. These areas include the north side of the road from mile mark 0.16-0.26 and again from mile mark 0.31-0.37. The area along the south side of the road identified for guard rail is from mile mark 0.15-0.16.

Immediate Action: No immediate action recommended.

Short to Mid Term: Install a total of 875 linear feet of guardrail on the north side of the road and 93 linear feet on the south side of the road in the areas noted above.

4.0 Recommended Improvements: Entire Corridor The Federal Highway Administration issued a Guidance Memorandum on Promoting the Implementation of Proven Safety Countermeasures in January of 2012. This guidance takes into consideration the latest research on measures intended to improve safety. The Guidance Memorandum lists nine different safety countermeasures, two of which could be applied on Shelburne-Hinesburg Road, including the following: A. Longitudinal Rumble Strips and Stripes on Two-Lane Roads Rumble strips are grooved patterns on the roadway, sometimes incorporated into the striping, that provide both an audible warning and a physical vibration to alert drivers

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Shelburne-Hinesburg Road Safety Study Shelburne, VT that their vehicle is leaving its lane. They can be incorporated into centerline and/or edge line striping to increase nighttime visibility of the pavement marking. Shoulder or edge line rumble strips significantly reduce run-off-road (ROR) crashes. Centerline rumble strips reduce cross center line crashes such as head-on collisions.

Similarly, maintaining the fog line (edge line) striping on rural roadways has been shown to help drivers confine their traveling path, especially at night, but has little or no effect on operating speeds.

Figure 7: Centerline Rumble Strip

Problem: Inattentive and inexperienced drivers frequently use this corridor, which can lead to vehicles inadvertently crossing the center line and lead to serious head on collisions.

Immediate Action: No immediate action recommended.

Short to Mid Term: Install continuous, milled center line rumble stripes are recommended for the length of Shelburne-Hinesburg Road. Instances of noise complaints by adjacent property owners have been documented, so public input is essential prior to this form of installment.

B.

Fog Lines and Safey EdgesSM

Fog lines are the traditional single continuous white line to demaracate the edge of a travelled way. Safety Edge is a technology that shapes the edge of a newly paved roadway at approximately 30 degrees from the horizontal surface.

Providing an edge treatment at this angle eliminates tire scrubbing when a vehicle leaves the roadway, which can cause loss of vehicle control. A vertical pavement edge can contribute to an increased frequency of roll-over, and research Figure 8: Safety Edge Illustration shows that crashes involving edge drop-offs are more likely to cause fatality.

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Shelburne-Hinesburg Road Safety Study Shelburne, VT Problem: Inattentive and inexperienced drivers frequently use this corridor, which can lead to vehicles inadvertently drifting into the shoulder and losing control of the vehicle leading to serious collisions with fixed obstacles within the right of way.

Immediate Action: Install fog lines on the edges of Shelburne Hinesburg Road, Maintain at least a 10’ travel lane width from centerline.

Short to Mid Term: It is recommended that this edge treatment be provided for future re-paving on Shelburne-Hinesburg Road (and other local roads). This is a treatment that the Agency of Transportation is now requiring on their paving projects.

5.0 Conclusion Shelburne-Hinesburg Road has a history crashes due to excessive speeds and limited visibility on curves. Due to the presence of Chittenden Valley Union High School in Hinesburg, this route is frequently used by inexperienced student drivers. An audit of roadway conditions has identified a number of specific and corridor wide areas where implementation safety measures could improve traffic safety and help to minimize crashes. These measures involve improved advanced warning signage and flashing beacons at curve locations, posting speed limits, installation of guardrail where warranted, implementing shoulder and centerline treatments, and maintaining or improving pavement striping and intersection alignments. Table 1 below is an Improvement Matrix summarizing the safety issue identified, short and long term recommendations for improvement, as well as preliminary cost figures for each item.

The Selectboard should review and evaluate whether these improvements can be budgeted and implemented in future years.

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Table 1: Improvement Matrix Location

Dorset Street/Falls Road (mm 0.91)

9-Dec-14

Identified Issue

Immed./Short Term Recommendation

Undefined Intersection

Pavement Striping Pilot with Delineator Posts

Estimated I/S Cost

Mid/Long Term Reccomendation

Estimated M/L Cost

Total Estimated Cost

$

7,250 Pavement Removal/Definition

$

25,000 $

32,250

Remove ledge outcrop to improve sight distance, +/- 100 400 cubic yards, in place

$

30,000 $

30,400

$

20,000 $

30,000

Horizontal Curve/Sight Summerfield Road Intersection (mm 0.29) Distance

Add Reduced Speed Plaque (35 mph) to curve signs x2

$

Horizontal Curve/Sight Summerfield Road Intersection (mm 0.29) Distance

Add Flashing Beacons x2

$

Station 29+50 to 33+00 (north side) (0.370.31)

Steep side slopes

n/a

$

-

Add guardrail, 350 lf

$

6,000 $

6,000

Station 36+50 to 41+75 (north side) (0.260.16)

Steep side slopes

n/a

$

-

Add guardrail, 525 lf

$

10,000 $

10,000

Station 40+40 to 41+33 (south side)(0.160.15)

Steep side slopes

n/a

Entire Road in Shelburne, both sides

Runoff/inattention

Add Fog Lines

$ $

- Add guardrail, 100 lf 1,000 Centerline Milling / Smart Edges

$ $

1,600 $ 5,000 $

1,600 6,000

$

18,650

$

10,000 Add Radar Speed Sign

97,600

Notes 1. Unit costs from VTRANS 2-year Averaged Price List July 2011- May 2013. a. Painted Island: $1/sf b. 36” x 36” sign ($12/sf) + post 10’ post ($8/lf) = $188, say $200 c. Steel beam guard rail w/8’ posts: $17.16/lf d. Rumble Strips Milled: $0.19/lf e. Remove and dispose pavements ($28.26/cy), topsoil ($25/cy), seed, mulch, traffic control, contingency, est. f. Remove and dispose pavements, gravel base ($34.12/cy), paving ($90/t), line striping, traffic control, contingency, est. g. Solid Rock excavation ($30/cy), traffic control, topsoil, seed, mulch, contingency, est. h. Costs are based on average prices and preliminary quantities for budgeting purposes only.

Actual costs may be higher or lower based on such factors as combining projects to reduce mobilization/demobilization costs, bidding climate, changes in material costs, and inflation. i.

Radar and flashing beacons based on vendor quote.

478 BLAIR PARK ROAD, WILLISTON, VT 05495 | 802.879.6331 | WWW.TCEVT.COM

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Disclaimer: The accuracy of information presented is determined by its sources.TCE is not responsible for any errors or omissions that may exist. Questions of on-the-ground location can be resolved by site inspections and/or surveys by a registered surveyor.

This map is not a replacement for surveyed information or engineering studies.

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Shelburne, VT Speed Limit Map Project: 2012005 Prepared By: LMJ Scale: 1 inch = 3500 Feet 12/20/13

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Notes Sources: Bing aerial photography (2012); VT E911 Roads (2011); Streams by ANR (2012); Guardrail by TCE (2014); Crash Locations by TCE (2014); Shelburne Parcel Data by Town (2011).

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Disclaimer: The accuracy of information presented is determined by its sources.TCE is not responsible for any errors or omissions that may exist. Questions of on-the-ground location can be resolved by site inspections and/or surveys by a registered surveyor.

This map is not a replacement for surveyed information or engineering studies.

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Shelburne-Hinesburg Road Shelburne, VT Safety Audit Recommendations

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Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

Project: 2012005 Prepared By: LMJ 1/8/14 1 inch = 400 feet

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Revisions No.

DOUBLE YELLOW CENTERLINE STRIPING WITH RUMBLE STRIP

Description

Date

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APPROXIMATE MILE MARKER STATION (TYP.) EXISTING "SHARP RIGHT TURN" SIGN WITH 25 MPH WARNING

DOUBLE YELLOW CENTERLINE STRIPING WITH RUMBLE STRIP

Use of These Drawings 1. Unless otherwise noted, these Drawings are intended for preliminary planning, coordination with other disciplines or

PROPOSED STOP BAR

They are not intended as construction drawings unless noted as such.

NEW STRIPING

2. Only drawings specifically marked For Construction are intended to be used in conjunction with contract documents, specifications, owner/contractor agreements and to be fully coordinated with other disciplines, including Drawings shall not be used for construction layout. Contact TCE for any construction surveying services or to obtain electronic data suitable for construction layout.

3. These Drawings are specific to the Project and are not transferable. As instruments of service, these drawings, and Changes to the drawings may only be made by TCE. If errors or omissions are discovered, they shall be brought to the attention of TCE immediately.

NEW STRIPING

Project Reference:

RELOCATE EXISTING "STOP" SIGN

4. By use of these drawings for construction of the Project, the Owner represents that they have reviewed, approved, and accepted the drawings and have met with all applicable parties/disciplines to insure these plans are Owner and Architect, are responsible for any buildings shown, including an area measured a minimum five (5) feet

EXISTING "SHELBURNEHINESBURG RD" SIGN

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Sta. 0+00 to Sta. 8+75 TUBULAR SURFACE MOUNT DELINEATOR POST 2013 TRUDELL CONSULTING ENGINEERS

LAST REVISED 01/10/2013

Date:

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Use of These Drawings 1. Unless otherwise noted, these Drawings are intended for preliminary planning, coordination with other disciplines or They are not intended as construction drawings unless noted as such.

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4. By use of these drawings for construction of the Project, the Owner represents that they have reviewed, approved, and accepted the drawings and have met with all applicable parties/disciplines to insure these plans are

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Project Title

B1

1) SIGNS A) MUTCD W1-6R/L

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SUMMERFIELD RD

IMPROVEMENT HIGHLIGHTS:

Shelburne-Hinesburg Road Improvements Shelburne Falls Road, Shelburne, VT

B) MUTCD W1-2R/L Sheet Title

MUTCD W13-1P 2) GUARD RAILS SHELBURNE-HINESBURG RD

True

4) SAFETY EDGE 5) RE-GRADING OF SHOULDER (SHOULDER TREATMENT) AASHTO INTERSECTION SIGHT DISTANCE: B1 - RIGHT-TURN FROM STOP OR CROSSING MANEUVER B2 - LEFT-TURN FROM STOP

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A

WEARING COURSE (TYPE III) (VAOT 406)

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CRUSHED GRAVEL (VAOT 704.05A FINE)

GRAVEL BASE (VAOT 704.04) OR CRUSHED GRAVEL (VAOT 704.05A COARSE)

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MIRAFI 500X STABILIZATION FABRIC INSTALLATION IN ACCORDANCE WITH MANUFACTURER'S RECOMMENDATIONS

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6" SAND BORROW AND CUSHION TO BE USED IN POORLY DRAINED SOILS OR OVER BEDROCK FOR ROADS AND SIDEWALKS (VAOT 703.03)

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By

UNDISTURBED SUBGRADE OR COMPACTED FILL

SECTION 49.5' R.O.W.

400 396 392 388 384 380 376 372 368 364 -80

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400 396 392 388 384 380 376 372 368 364 20

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49.5' R.O.W.

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NOTES: THICKNESS (INCHES) ROADS

PARKING LOTS

PRIVATE

RESIDENTIAL

COMMERCIAL

RESIDENTIAL

COMMERCIAL

DRIVEWAYS

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TYPICAL BITUMINOUS PAVEMENT 2013 TRUDELL CONSULTING ENGINEERS

49.5' R.O.W.

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49.5' R.O.W.

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-60

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I. SUBBASE, SAND CUSHION AND SUBGRADE SHOULD BE CONSTRUCTED AND COMPACTED TO THE DIMENSIONS SHOWN IN ACCORDANCE WITH VERMONT AGENCY OF TRANSPORTATION SPECIFICATIONS, STANDARD A-76. WHERE MORE STRINGENT LOCAL ORDINANCES HAVE BEEN ADOPTED RELATIVE TO ROAD DIMENSIONS AND CONSTRUCTION, THEY SHOULD GOVERN. 2. COMPACT ALL SUBBASE MATERIALS TO 95% MAXIMUM DENSITY (STANDARD PROCTOR).

3. IF GROUNDWATER OR SOFT SPOTS ARE ENCOUNTERED CONTACT THE ENGINEER TO DISCUSS ADDED MEASURES SUCH AS UNDERDRAIN. SLOPE SUBBASE TO UNDERDRAIN LOW POINTS.

1"=1'

LAST REVISED xx/xx/2013

SD-001

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Use of These Drawings 1. Unless otherwise noted, these Drawings are intended for preliminary planning, coordination with other disciplines or They are not intended as construction drawings unless noted as such.

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2. Only drawings specifically marked For Construction are intended to be used in conjunction with contract documents, specifications, owner/contractor agreements and to be fully coordinated with other disciplines, including Drawings shall not be used for construction layout. Contact TCE for any construction surveying services or to obtain electronic data suitable for construction layout.

80

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Owner and Architect, are responsible for any buildings shown, including an area measured a minimum five (5) feet

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5. It is the User's responsibility to ensure this copy contains the most current revisions.

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Changes to the drawings may only be made by TCE. If errors or omissions are discovered, they shall be brought to the attention of TCE immediately.

392 388 384 380 376 372 368 364

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49.5' R.O.W.

392 388 384 380 376 372 368 364

49.5' R.O.W.

380 376 372 368 364 360

N G I ONA L E N

Project Title

Shelburne-Hinesburg Road Improvements

80

Shelburne Falls Road, Shelburne, VT

ROAD CROSS SECTIONS 1" = 20'

Sheet Title LEDGE

Road Sections STA. 30+00 to 38+00

EXISTING GRADE TEMPORARY EASEMENT

49.5' R.O.W. 36'

2' SHOULDER

E.O.P

E.O.P

Project Reference:

3. These Drawings are specific to the Project and are not transferable. As instruments of service, these drawings, and

CENTERLINE RUMBLE STRIPS

6'

LEDGE T.B.R. 2'

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12' 1

2%

EXISTING ROAD GRADE

1 1

Date:

12/12/13

Scale:

SHOWN

Project Number:

2012005

Drawn By:

NPC

Project Engineer:

JMM

Approved By: 1

1 3

3

FINISHED GRADE

SEE DETAIL THIS SHEET FOR SUBGRADE MATERIAL

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TRUDELL CONSULTING ENGINEERS 478 BLAIR PARK ROAD | WILLISTON, VERMONT 05495 802 879 6331 | WWW.TCEVT.COM

Revisions No.

Description

Date

By

108

FIE ER M M SU LD

Use of These Drawings 1. Unless otherwise noted, these Drawings are intended for preliminary planning, coordination with other disciplines or

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Project Reference:

4. By use of these drawings for construction of the Project, the Owner represents that they have reviewed, approved, and accepted the drawings and have met with all applicable parties/disciplines to insure these plans are

Photo 108

Direction EB

Station 24+50

Owner and Architect, are responsible for any buildings shown, including an area measured a minimum five (5) feet

Note: Curve approach w/ sign

5. It is the User's responsibility to ensure this copy contains the most current revisions.

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S:\_TCE DRAWINGS\2012\005 Shelburne-Hinesburgh\2012005 - Site Plans.dwg, 1/10/2014 1:08:47 PM

Project Title

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Shelburne-Hinesburg Road Improvements

Sheet Title

STA.17+55--STA.26+32.5

Date:

6/29/2012

Scale:

1" = 30' HORIZ. 1" = 3' VERT.

Project Number:

2012005

Drawn By:

NPC

Project Engineer:

JMM

Approved By:

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TRUDELL CONSULTING ENGINEERS

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478 BLAIR PARK ROAD | WILLISTON, VERMONT 05495 802 879 6331 | WWW.TCEVT.COM

Revisions No.

Description

Date

By

102

103

105 109

106

Use of These Drawings 1. Unless otherwise noted, these Drawings are intended for preliminary planning, coordination with other disciplines or They are not intended as construction drawings unless noted as such.

2. Only drawings specifically marked For Construction are intended to be used in conjunction with contract documents, specifications, owner/contractor agreements and to be fully coordinated with other disciplines, including Drawings shall not be used for construction layout. Contact TCE for any construction surveying services or to obtain electronic data suitable for construction layout.

3. These Drawings are specific to the Project and are not transferable. As instruments of service, these drawings, and Changes to the drawings may only be made by TCE. If errors or omissions are discovered, they shall be brought to the attention of TCE immediately.

Project Reference:

4. By use of these drawings for construction of the Project, the Owner represents that they have reviewed, approved, and accepted the drawings and have met with all applicable parties/disciplines to insure these plans are Owner and Architect, are responsible for any buildings shown, including an area measured a minimum five (5) feet

5. It is the User's responsibility to ensure this copy contains the most current revisions.

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Notes: from Summerfield Dr toward east - sight distance from Summerfield Road toward west guardrail on north side of road from 30+00 to 32+00 vertical pavement edge sight distance - curve

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S:\_TCE DRAWINGS\2012\005 Shelburne-Hinesburgh\2012005 - Site Plans.dwg, 1/10/2014 1:19:17 PM

Project Title

Shelburne-Hinesburg Road Improvements

Sheet Title

STA.26+32.5--STA.35+10

Date:

6/29/2012

Scale:

1" = 30' HORIZ. 1" = 3' VERT.

Project Number:

2012005

Drawn By:

NPC

Project Engineer:

JMM

Approved By:

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TRUDELL CONSULTING ENGINEERS 478 BLAIR PARK ROAD | WILLISTON, VERMONT 05495 802 879 6331 | WWW.TCEVT.COM

Revisions No.

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Drawings shall not be used for construction layout. Contact TCE for any construction surveying services or to obtain electronic data suitable for construction layout.

RD EIL ON

3. These Drawings are specific to the Project and are not transferable. As instruments of service, these drawings, and Changes to the drawings may only be made by TCE. If errors or omissions are discovered, they shall be brought to the attention of TCE immediately.

Station 42+00 40+50 40+50 38+60

Note: Summerfield approach - curve sign obscured by vegetation Needs guardrail on north side of road sta. 38+75 to 41+60 Needs guardrail on south side of road sta. 40+30 to 41+50 Note curve/trees/bank on south side of road

5. It is the User's responsibility to ensure this copy contains the most current revisions.

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N G I ONA L E N

S:\_TCE DRAWINGS\2012\005 Shelburne-Hinesburgh\2012005 - Site Plans.dwg, 1/10/2014 1:18:38 PM

Project Title

Shelburne-Hinesburg Road Improvements

Sheet Title

STA.35+10--STA.43+87.5

Date:

6/29/2012

Scale:

1" = 30' HORIZ. 1" = 3' VERT.

Project Number:

2012005

Drawn By:

NPC

Project Engineer:

JMM

Approved By:

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TRUDELL CONSULTING ENGINEERS 478 BLAIR PARK ROAD | WILLISTON, VERMONT 05495 802 879 6331 | WWW.TCEVT.COM

Revisions No.

Description

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3. These Drawings are specific to the Project and are not transferable. As instruments of service, these drawings, and Changes to the drawings may only be made by TCE. If errors or omissions are discovered, they shall be brought to the attention of TCE immediately.

Project Reference:

4. By use of these drawings for construction of the Project, the Owner represents that they have reviewed, approved, and accepted the drawings and have met with all applicable parties/disciplines to insure these plans are Owner and Architect, are responsible for any buildings shown, including an area measured a minimum five (5) feet

Note: View from driveway on north side - clear sight distance View toward west from driveway on south side View toward east from driveway on south side begin gravel shoulder on north and south side of road

5. It is the User's responsibility to ensure this copy contains the most current revisions.

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S:\_TCE DRAWINGS\2012\005 Shelburne-Hinesburgh\2012005 - Site Plans.dwg, 1/10/2014 1:17:56 PM

Project Title

Shelburne-Hinesburg Road Improvements

Sheet Title

STA.43+87.5--STA.52+65

Date:

6/29/2012

Scale:

1" = 30' HORIZ. 1" = 3' VERT.

Project Number:

2012005

Drawn By:

NPC

Project Engineer:

JMM

Approved By:

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Shelburne PD Speed Study November 2012 95 90 85

85th Percentile

80 75 70 65

Percentile

60 55 50 45 40 35 30 25 20 15 10 5 30.0

35.0

40.0

45.0 Speed (mph)

50.0

55.0

60.0

DATE

JOB NO.

8/28/09

NA

TRUDELL CONSULTING ENGINEERS (TCE)

PROJECT

P.O. Box 308, 478 Blair Park Road Williston, VT 05495 Tel. (802) 879-6331 Fax. (802) 879-0060

LOCATION

TO:

JMM

Shelburne Falls Rd Hinesburg WEATHER:

Sunny 60 PRESENT AT SITE

AAL/ AEA THE FOLLOWING WAS NOTED:

We arrived on site at 9:30am In the northbound direction, there is a speed limit sign posted at 45 mph near the Shelburne/Hinesburg border. In the southbound direction, there is a 35 mph speed limit sign posted just south of the Dorset Street/Pond Road intersection.

At the 90 degree curve where Dorset Street splits into Shelburne-Hinesburg Road (north/west of the site), there is a warning sign posted with a recommended speed of 25 mph for the curve in both the north and southbound directions.

There is a warning “S” curve sign on both the Northbound and Southbound sides of the curve The attached map illustrates the speed limit signs and “S” curve sign locations.

We drove through the curve on Shelburne-Hinesburg Road near Summerfield Road once to get a feel of the road – see attached map for curve location.

A Rieker Ball Bank Inclinometer Model 1023W1 was mounted to the dashboard, and readings were taken at varying speeds while driving through the curve in both the northbound and southbound directions.

The test was started at 30 mph and was increased in 5 mph increments through the curve for each pass up to 45 mph (the posted northbound speed limit). The speed was then reduced by 5 mph to get secondary readings until a speed of 30 mph was met.

According to The Manual on Uniform Traffic Studies, Chapter 11: Safe Curve Speed Study, “…..10 degrees for speeds of 35 mph through 50 mph are the usually accepted limits beyond which riding discomfort will be excessive and loss of vehicle control may occur.” (11-2) The first part of the Southbound “S” curve was insignificant compared to second part of the Southbound “S” curve (Northbound first part).

The curve just north of the study between Dorset Street and Shelburne-Hinesburg Rd, has a recommended speed of 25mph which gave a degree reading of 13 for northbound and 10 for southbound.

S:\_TCE PROJECTS\JMM\Shelburne-Hinesburg Road Speed Study\Field Report 8-28-09.doc

COPIES TO:

file

FIELD REPORT SIGNED:

AEA

PROJECT MEMO To:

JMM

From:

AEA

Date:

8/28/09

Re:

Shelburne Falls Rd

Project #:

JMM

According to the Manual on Uniform Traffic Studies, Chapter 11 Safe Curve Speed Study the speed limit of 45mph is too great for this curve. At a speed of 45mph the inclinometer climbed to 20 degrees, which is twice as much as the recommended safe value. The curve connecting Dorset Street and ShelburneHinesburg Rd is 25mph the inclinometer climbed to 13 degrees going Northbound and 10 degrees going Southbound. Using the previous values as a base, the recommended speed for the curve that was studied should be 35mph.

TRUDELL CONSULTING ENGINEERS (TCE) P.O. Box 308 478 Blair Road Williston, VT 05495 802-879-6331 fax: 802-879-0060 trudellconsulting.com