Drivers in Kirkham are facing rush hour disruption after work to replace a railway bridge started.
Temporary traffic lights on Station Road were implemented for the first time on Sunday as Network Rail began work rebuilding the bridge.
Drivers are set to face delays for three months while the reconstruction work continues.
Coun Keith Beckett says residents have already felt disruptions in the early stages of the work.
He said: “I’ve been told it was chaotic at the weekend as the traffic lights were stuck on red meaning the police had to be called out to help.
“The chaos is at its worse at school time with all the traffic trying to get back onto the main road from Kirkham Grammar School.
“These early delays do not look good for the future.”
Network Rail says the work is essential as the bridge on Station Road has reached the “end of its life expectancy”.
A spokesman for Network Rail added: “It wasn’t possible to carry out the rebuild during the last year’s work as we were unable to completely close the railway.
“However, the work has been carefully planned – including building the new bridge in two halves – to be completed safely in the shortest period of time.”