Drivers who take Interstate 95 through Norwalk may notice an improved traffic flow.
Officials say the work to provide an additional lane in each direction near Exit 14 has been completed five months ahead of schedule on the northbound side.
The work is aimed at giving drivers more time to adjust their speed in an area where about 140,000 cars pass through each day.
Sen. Bob Duff says it will make the area safer and ease congestion, which he hopes will benefit the local economy.
Work is still being done on the southbound speed change lanes, which are expected to open in the spring.
Duff says the total project will cost $42 million. The project also includes work on three overpasses in Norwalk and upgrading four intersections on Post Road.