Hartsfield-Jackson International Airport is warning travelers to allow more time to get to the domestic terminal for their flights, as the airport embarks on a two-year construction project to revamp the roads leading to the terminal.

Construction is expected to start by Sept. 1 on the $48.5 million roadway overhaul. The city has signed a contract with C.W. Matthews Contracting Co. Inc. for the project, which will be paid for with passenger facility charges on airline tickets.

The improvements to the road network between I-85 and Camp Creek Parkway on the north and Riverdale Road on the south will include widening roadways and improving weaving conditions and signs. Among the goals is to avoid backup, blockage and delays.

The work will include new bridges, pavement, walls, lighting and signs and will relocate the airport entrance at Riverdale Road.

The airport plans to phase the work to maintain the number of traffic lanes, but said passengers should allow extra time to get to the terminal because of "temporary roads, lane shifts and reduced speeds."

Drivers "will need to pay special attention and take extra caution as they travel to and from Hartsfield-Jackson in the coming months," Hartsfield-Jackson general manager Louis Miller said in a written statement.