Georgia 10 May 9, 2018

State Supplement sponsored by:

441

59

75

Cornella 19

Rome 85 27

Athens

GEORGIA STATE EDITION

A Supplement to:

441

Atlanta

20

Madison Augusta

85

20

Griffin 1

129

Milledgeville

75

La Grange

Macon

301

185 19

16

Dublin

Swainsboro Oak Park

Columbus

Statesboro

341 441 16

Lyons Americus

Savannah

McRae

301

1

Cordele

27 82

Dorchester

341

Cuthbert

75

Albany

84

Douglas Tifton

82

95

82

Blakely

Pearson 27 84

Moultrie

19 319

Bainbridge

84

Valdosta Thomasville

1 441

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Project Could Save Motorists Eight Hours Per Year

By Irwin Rapoport

With a goal to reduce traffic congestion and enhance safety, the Georgia Department of Transportation (GDOT) has awarded an $800 million contract to North Perimeter Contractors LLC to complete the Transform 285/400 project in 2020.

This priority project for the state adds new flyover ramps, collector-distributor lanes and other facilities to aid east-west travel along I-285 and north-south travel along SR 400. It will improve 4.3 mi. of I-285 from west of Roswell Road to east of Ashford Dunwoody Road and 6.2 mi. along SR 400 from the Glenridge Connector to Spalding Drive. The Mount Vernon Highway bridge over SR 400 will be reconstructed, the Abernathy Road and SR 400 interchange is being reconstructed as a diverging diamond interchange (DDI) and a shared-use path to provide a connection through the interchange for planned bike/pedestrian facilities is being built in the southeast portion.

The groundbreaking took place in November 2016 and construction began in earnest in February 2017 with a focus on constructionrelated activities such as utility relocations, roadside clearing and geotechnical and survey work. In October 2017, work began on the reconstruction of the Mt. Vernon Bridge replacement, which should be completed in early 2019.

The design-build-finance project (DBF) also will improve operational efficiency by saving 20,000 hours per-day in travel times by 2019, reducing weaving along I-285 and SR 400, and improve ramp geometry at I-285/SR 400 interchange. It is being funded through a combination of state, federal and local sources, as well as privatepartner financing. Local contributions from community partners include $10 million from the PCIDs, $1 million from the PATH Foundation and an additional $2.25 million from the city of Sandy Springs for bicycle and pedestrian enhancements.

Albert Welch, PE., GDOT’s program manager, stressed that the project is much needed.

“It is expected to save the average commuter eight hours a year and reduce delay over 20,000 hours a day,” he said. “The project is following a Public Private Partnership and DBF delivery model, which allows the State to transfer the project’s design, construction and part of the initial financing responsibility to a private sector partner. This enables the State to leverage funding to accelerate project delivery and benefit from private sector innovations. When completed, GDOT will be responsible for the long-term maintenance and operation of the new road infrastructure.”

Welch added that bicycle and pedestrian improvements — part of the plan to reduce congestion — are funded, in part, by contributions from local community partners.

“There will be additional bicycle and pedestrian improvements made across Mount Vernon Bridge and along Abernathy Road through the DDI to help facilitate bicycle and pedestrian connec-

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The project will improve 4.3 mi. of I-285 from west of Roswell Road to east of Ashford Dunwoody Road and 6.2 mi. along SR 400 from the Glenridge Connector to Spalding Drive.

see GDOT page 4

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Drainage Poses Major Engineering Challenge to Project GDOT from page 1

tions,” he said.

The new infrastructure was designed by Louis Berger (the I-285 section) and Neel-Schaffer Inc. (the SR 400 section).

The original plan was to have the project split into two sections, but after reconsideration, it was determined to go with a combined project.

“The job is being done in one of the most highly travelled roadway areas in Metro Atlanta — about 400,000 vehicles pass through the interchange daily at peak hours,” said Albert, “which continue to grow, be it in the morning or evening. It’s your standard bridge, wall, and roadway construction, but it is taking place in a very tight corridor.”

Drainage is a major engineering challenge.

“We have a lot of perennial streams and drainage areas, This priority project for the state adds new flyover and they have to be tied into the existing infrastructure,” said ramps, collector-distributor lanes and other facilities Albert, “and a lot of those alternative requirements, whether to aid east-west travel along I-285 and north-south it be with the core — we have a policy with requirements to travel along SR 400. prevent downstream flooding — and those type of things.”

The designs for the infrastructure had to take traffic into account.

“At some point we have to transfer traffic so that we can build the flyovers along I-285 and SR 400,” said Albert.

“There are a lot of bridges that have to be replaced and that all has to be done in a way that meets the public demand to drive through the construction area.”

Standard construction materials are being used, but “GDOT has always been pretty advanced when it comes to pavement types,” said Albert, who noted that highway infrastructure projects are designed to meet traffic demands 20 years plus.

The lifespan for road and bridge projects is between 50 and 100 years with proper maintenance.

“We go by AASHTO’s typical design criteria. It would be 20 loadings on our bridges and HB67s for our tracks. We’re pretty conservative when it comes to our structural designs and loadings on the roadways.”

Noise barriers will be placed in selected locations along I285 and SR 400, within the project limits, to deal with complaints. They will feature a light, “gull gray” stone appearance with graffiti-proof coating. The contract encourages barriers to be set up on a practical basis early on.

The traffic impacts include night work and lane closures, The project is in the early stages of roadway construcwith local roadways, streets and intersections being kept tion.

The groundbreaking took place in November 2016 and construction began in earnest in February 2017 with a focus on construction-related activities such as utility relocations, roadside clearing and geotechnical and survey work.

open to the greatest extent possible to maximize traffic flow.

Message signs and coordinated ITS systems are being utilized to inform motorists, police officers are directing traffic for lane closures and traffic and construction information is being posted to the project web page, Georgia NaviGAtor 511, social media, traditional media, and partner websites “A significant amount of the work will be done during offpeak, nighttime hours to reduce impact on the commute to and from work as much as possible,” said Welch. “We’re encouraging the use of transit and ridesharing during the construction. MARTA offers bus and train route and the Xpress coach service has four routes bringing commuters into the area.”

Construction is taking place 24/7, seven days a week to meet the work schedule. North Perimeter crews, thus far, have removed 80 percent of the vegetation along both I-285 and SR 400 and reconstructed 30 percent of the Mount Vernon Highway bridge.

The benchmarks for the 2018 construction season are to proceed with the flexible shoulder lane closure on SR 400 northbound and southbound, construction of the flyover ramps in the interchange and the collector-distributor lane along I-285 and SR 400.

“One of the main challenges for the project is maintaining traffic during construction,” said a North Perimeter spokesperson. “The Transform 285/400 Interchange Improvement project is in the heart of one of metro Atlanta’s busiest residential and business districts with more than 400,000 cars passing through the interchange per day.

“Traffic without construction is already challenging and adding construction will heavily impact the traveling public,” added the spokesperson. “We will continue to work closely with GDOT and partners to minimize construction related impacts while we work to safely and effectively deliver the project. Regular communication with the Georgia DOT is important to the success of the project. It is also very important to communicate with the public about upcoming lane closures.”

The bridge work is proceeding as planned.

“There are over 30 bridges in the Transform 285/400 Interchange Improvement Project. Bridge reconstruction work began on the Mount Vernon Highway bridge in late 2017, and motorists will begin to see more construction on see GDOT page 6

With a goal to reduce traffic congestion and enhance safety, the Georgia Department of Transportation (GDOT) has awarded an $800 million contract to North Perimeter Contractors LLC to complete the Transform 285/400 project in 2020.

Construction Equipment Guide • Georgia State Supplement • www.constructionequipmentguide.com • May 9, 2018 • Page 5

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Page 6 • May 9, 2018 • www.constructionequipmentguide.com • Georgia State Supplement • Construction Equipment Guide

SAFE ON THE ROAD

Project Remains in Design, Early Road Construction Phase GDOT from page 4

SAFE E ON YOU UR SITE

bridges in the interchange this year. “ The project is in the early stages of roadway construction.

“Roadway construction will begin on northern end of SR 400 and along I-285 this year. Concrete barrier has been installed within the corridor and more will be installed this year. The speed limit was lowered to 55mph. We work closely with local police officers as they help to enforce the speed limit. “ The overall project is still in the design phase and final quantities for materials being removed and brought in are under review.

The recycling plan for the project is all encompassing, extending from the field to the office.

On a peak day there are more than 500 workers on-site, and so far more than 276,000 man-hours have been logged.

On this project, North Perimeter Contractors LLC is using a variety of equipment such as cranes, excavators, dozers, loaders, pavers, and rollers from a variety of dealerships.

(This story also can be found on Construction Equipment Guide’s website at www.constructionequipmentguide.com.)

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Albert Welch, PE., GDOT’s program manager, stressed that the project is much needed.

OTD Partnership Launches Traffic Count Application Georgia Department of Transportation’s Office of Transportation Data (OTD) provides traffic data, products and services that help local governments and the public make data-driven transportation decisions concerning traffic patterns and flow, design of new roads, traffic signage or signalization needs and a number of other determinations.

On April 2, OTD launched a new traffic data application that combines traffic data collection, analysis and presentation services into a single application.

The Traffic Analysis and Data Application (TADA) is a result of a partnership between traffic engineering and transportation planning firm Southern Traffic Services Inc. and traffic data analysis software provider Drakewell Inc. “The future of traffic data collection, analysis and reporting has arrived,” said Georgia DOT State Transportation Data Administrator Paul Tanner. “TADA provides advanced features and improved product support for less cost to meet today’s dynamic

traffic data requirements.”

TADA is the latest effort in OTD’s continuing commitment to provide the right data, at the right time, and with the right quality to customers. The TADA application, which replaces the GeoCounts traffic data solution, offers a new, easy to understand interface with advanced features including detailed searches, selection of multiple sites, and multiple export options, according to the company.

Features of TADA: • Traffic count collection stations: continuous count/permanent (24/7/365), weigh-in-motion and short term counts/portable (48 hours) • Interactive map interface • Graphs, charts and tabular visualizations • Summary data reports • Standard time interval selections (This story also can be found on Construction Equipment Guide’s website at www.constructionequipmentguide.com.)

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