Pedestrian safety has prompted council chiefs to install a new town centre barrier.
The gate is to be put in on New Market Street at its junction with High Street.
Chorley Council has acted following abuse of the one-way system, which it is feared, is putting pedestrian safety at risk.
Coun Peter Wilson, deputy leader of Chorley Council, said: “We are not changing any of the regulations, this has been a pedestrian zone between the hours of 11am and 4pm for more than 20 years.
“However, there are businesses which have been contravening the one-way system and the parking restrictions, and traders in the town centre themselves raised this via our town team because they were concerned about people’s safety.
“By installing the gate on New Market Street we are just ensuring that during the main shopping hours, pedestrians are able to shop in a safe and pleasant environment.”
Coun Ralph Snape said: “I was a little bit apprehensive at the beginning.
“Now it has been explained to us, I’m happier it will safeguard the pedestrians.
“All the vehicles can be controlled now instead of just going through at any time and the pedestrians not knowing if they’re going to be knocked over or not. I think it will save people from being maimed.
“The traders will be able to arrange for deliveries. All they have to do is pick up a phone and it will be arranged for vehicles to get through.”
Malcolm Allen, chairman of Chorley Traders’ Alliance, said: “It improves safety within the town centre.
“Some drivers ignore the ‘no entry’ signs and drive through. It wouldn’t happen in a major city.”