Bigger signs are top be erected along a Preston road in a bid to get traffic to slow down.
And residents have been warned police will be asked to carry out patrols with cameras if problems persist along 20mph areas.
County Coun Michael Welsh, who represents Preston North East on Lancashire County Council, said people had raised issues of speeding during a walkbout in Fulwood.
He said: “It seems that motorists are ignoring the 20 mph signs and travelling at high speed along Windermere Avenue and the lower part of Coniston Road particularly when Watling Street Road is congested.
“We have requested large 20mph signs to be installed on Windermere Avenue and for a speed audit to determine how often the problem occurs.”
He added: “If the speed audit shows a high incidence of speeding the police will be asked to carry out a camera patrol.”