The 30-mile project will create two new tolled, reversible lanes on the west side of I-75.
Groundbreaking of the managed lanes in Cobb is set for September, said Natalie Dale, spokeswoman for the Georgia Department of Transportation.
In north Cobb, one reversible lane will be added to a portion of I-575. One reversible lane will also be added to the portion of I-75 that runs north of where I-75 intersects with I-575.
The new exits can only be used to get onto the new reversible lanes, said John Hancock, the project manager.
The exits, which can be used to get on and off the highway, will be built in different locations from where the exits from I-75 are located now.
“We wanted to put the new exits where interchanges weren’t already in place, so that we don’t increase traffic in those areas,” he said.
Hancock estimated construction on the new exits won’t start until September 2015.
Tim Lee, the chairman of the Cobb Board of Commissioners, said he thinks the project will ease traffic in Cobb.
“The reason I think (the new exits) will be a positive is they’re at non-I-75 locations, so the exits onto the managed lanes have their own locations. So, they won’t create additional traffic in those areas,” Lee said.
One new exit will be on Roswell Road by the Big Chicken.
Another new exit will be at Terrell Mill Road, between the existing exits at Delk Road and Windy Hill Road.
Two more exits will be created to get onto the managed lanes in Cumberland at the intersection of I-285 and at Akers Mill Road.
Drivers will also be able to get onto the managed lanes from I-575 where it intersects with I-75.
With the new exits added, drivers will have four exits to choose from to get onto the new reversible lanes of I-75.
Drivers can get onto the existing lanes of I-75 by the five exits already in place.
“I think the managed lanes project is going to be an absolute positive project to help ease some of the transportation concerns,” Lee said.
Hancock said the new lanes will not look the same as the usual highway exits. The exits will have two lanes, but only one will be open at a time. Which one is open will depend on which way traffic is flowing.
Hancock said traffic will flow southbound during the morning rush hour and northbound during the evening rush hour on the two reversible lanes, but the department has not yet decided on specifics.
Details about where toll booths will be on the managed lanes have not been decided, Hancock said.
“There will be barrier gates on the section of the exit that is closed, and those lanes will not be able to be accessed,” Hancock said.
The roads where new exits will be built might experience some traffic during construction, Hancock said.
“There will be some impact to traffic, but they’re only allowed to work on those roads in non-peak hours,” Hancock said.
Drivers should only see construction crews on Roswell Road and Terrell Mill Road during evening or early morning hours, Hancock said.
Marietta Mayor Steve Tumlin said he wanted people to know more about the project and was excited the departments were communicating more with the public.
“It’s great that we’re giving people notice of when (construction projects are) coming,” Tumlin said.
Tumlin said residents should expect a lot of orange cones on the road in the years to come.
“Those driving on (Highway) 41 and in the I-75 corridor, buckle your seat belts,” Tumlin said. “We’re going to be inconvenienced, but we’re going to have a better transportation system in Marietta.”