Gardaí have issued a warning to motorists to obey the temporary traffic lights after a number of incidents at Old Town Letterkenny.
Four sets of traffic lights have been placed at routes approaching the Old Town Road in front of Old Dunnes for the second phase of the Irish Water works in the area.
The traffic management system caused lengthy delays on the first day of operation.

Traffic approaching roadworks at Old Town Road 06/08/2019
Motorists experienced tailbacks of up to 40 minutes from the Aura Letterkenny to the busy junction on Tuesday.
Gardaí say they have received reports of motorists not obeying the traffic lights.
A spokesperson issued this warning: “Everybody has a destination to go to and nobody likes waiting in traffic but by not obeying the traffic lights you only cause a delay for others and also run the risk of being involved in a collision.
“Gardaí will be monitoring the traffic flow in the area and if they observe someone driving through a red light then they will have no option but to deal with that person accordingly.
“We all have to follow the rules of the road and we all want to get home safely so please drive with due consideration and have patience.”
Meanwhile, local residents have called for the works to be halted to accommodate mourners visiting a wake in the Crievesmith area.