Larry Mason, with the city's electrical department, said westbound traffic on Second Avenue has been snarled at times for about a month.
That's when the signals were changed, allowing drivers coming toward Broad from FMC to take a left onto Broad while all traffic going westbound was delayed.
That created a backup on Second Avenue at Broad and First Street.
Mason said this morning that the change should noticeably improve traffic flow on Second Avenue. The change will not affect drivers approaching the intersection from Broad Street.