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Ten Mile & Amity

December 2017


Ten Mile & Amity

Description Build a roundabout at the intersection of Ten Mile and Amity • One lane in center • Two lanes approaching the roundabout • One for making the first right turn • One to enter the roundabout Roundabout will be designed so it can easily be expanded to two center lanes when needed in the future.

Construct sidewalks, curb, and gutter December 2017

Add bike facilities


TEN MILE ROAD

Ten Mile & Amity

Entering\Exiting Lanes Typical Section

Sidewalk

Pedestrian crossing

Truck apron

Bike Ramp

Center Island

AMITY ROAD

Splitter island

AMITY ROAD

Bike Lane

New Pavement Sidewalk Concrete Curb Existing Property Line Proposed New Right-of-Way New Drive Approach

TEN MILE ROAD

Pedestrian Ramps Splitter Median Island

Circulating Typical Section December 2017


Ten Mile & Amity

Background & Timeline Learn more!

Amity Road Corridor Concept Study Adopted

2008

2009 • Public open house to gather input on initial design • Design put on hold

Design was put on hold when anticipated surrounding development did not occur. December 2017


Ten Mile & Amity

Ten Mile & Amity

Surrounding development plans have resumed.

• Design resumes • Seek input on revised design

2017

2018 Fall/Winter • Refine and finalize design Spring/Summer • Purchase right-of-way

December 2017

Construction

2022 Construction year could be earlier, depending on future development.


Ten Mile & Amity

Purpose

Increase safety for current and future users: motorists, pedestrians, and bicyclists

Accommodate future traffic volumes

Improve intersection operations

December 2017


Ten Mile & Amity

December 2017

Project Considerations

Safety for motorists, pedestrians, and bicyclists

Future traffic volumes

Future pedestrian & bicyclist connectivity

Future development

Property impacts

Utilities


Ten Mile & Amity

Traffic Volumes The numbers below represent the approximate number of vehicles entering the Ten Mile and Amity intersection during the peak hours.

Morning 7-8 a.m.

Evening 5-6 p.m.

December 2017

1,691

934

Vehicles/peak hour

EXISTING

2040 PROJECTIONS

1,033

2,055

Vehicles/peak hour

EXISTING

2040 PROJECTIONS

Vehicles/peak hour

Vehicles/peak hour


Roundabout Safety Ten Mile & Amity

Roundabouts typically eliminate the most severe intersection accidents — angle and head-on collisions.

ROUNDABOUTS HAVE

FEWER USER CONFLICTS

48%

fewer crashes than signalized intersections

Traditional Roundabout 8 conflict points

78%

fewer injury and fatal crashes than signalized intersections

Traditional Intersection 32 conflict points Diverging

December 2017

Statistics and graphics from the National Cooperative Highway Research Program (NCHRP), Report 672

Merging

Crossing

National Cooperative Highway Research Program (NCHRP), Report 672


Ten Mile & Amity

Roundabout Safety Two-stage crossing = pedestrian safety A pedestrian crossing at a traffic signal must watch for vehicles turning right or left on green, vehicles turning right on red, and vehicles running the red light, which often occurs at high speeds. At a roundabout, pedestrians cross the street in two stages, one lane at a time. At each stage the pedestrian only has to look in one direction to cross the street. Splitter island

1

December 2017

2

1

When clear, cross to the splitter island

2

Wait in the splitter island until roadway is clear and cross to the opposite side.


Ten Mile & Amity

Roundabout Safety

BICYCLIST BENEFITS • Bicyclists and vehicles travel at similar speeds, which increases safety for bicyclists • Reduced high-speed conflict points • Simplified turning maneuvers • Bicyclists can either ride with traffic inside the roundabout or circulate as a pedestrian, using the sidewalk.

December 2017


Ten Mile & Amity

Roundabouts & Large Vehicles Roundabouts are designed to accommodate large vehicles, providing a wider turning radius for trucks and other long vehicles

Truck apron

A “truck apron� on the edge of the center island allows large vehicles and trucks with trailers to maneuver through a roundabout by allowing the wheels of the truck or trailer to roll onto the apron. December 2017

Truck apron

Semi-trucks, emergency vehicles and school busses will be able to drive through the roundabout


Ten Mile & Amity

December 2017

Typical Signage & Navigation


Ten Mile & Amity

What is Next? Thank you for reviewing the project information!

ACHD will address the comments received from the public and finalize the design.

Construction is anticipated for 2022, but could start earlier depending on the pace of future development.

Take the survey! While your comments are always welcome, they can be best used if received by January 11, 2018.

December 2017


Ten Mile & Amity

Learn More Click on the following links to learn more about roundabouts. Learn how to use a roundabout as a motorist, pedestrian and/or bicyclist.

AARP: Modern Roundabouts

VIDEOS Modern Roundabouts: A Safer Choice State of Minnesota: Roundabout Myths 36th, Hill, Catalpa Intersection: How to Use a Roundabout December 2017

Profile for Ada County Highway District

Ten Mile and Amity Online Display Book  

Ten Mile and Amity Online Display Book  

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