Motorists were caught in long delays after one of Lancaster’s major routes was closed this week.
Costain, the company building the M6 link road, had to completely close Torrisholme Road after confusion over where a water main was located.
The closure – from Russell Drive to Lancaster and Morecambe College – caused travel misery for motorists with journeys which normally take five minutes lasting 60.
One driver said they spent an hour travelling from Greyhound Bridge to White Lund as queueing traffic backed up.
Morecambe Road was among the worst-hit areas.
Costain said work to test water main diversion connections had been completed ahead of schedule and Torrisholme Road had re-opened after three days of closure..
It was due to remain shut until 6am this morning.
Costain project manager Andrew Langley apologised for the disruption.
He said: “There was never an intention to fully close Torrisholme Road other than when the beams for the new bridge over Torrisholme Road were due to be installed.
“Engineers discovered the water main that was planned to be diverted to make way for the bridge was actually located in the middle of Torrisholme Road and not nearer the footpath as the plans suggested.
“This meant the water main diversion was unable to be undertaken under a single lane closure as originally planned, which consequently would have kept Torrisholme Road open to traffic and alleviated the need for a full road closure.
“We apologise that the exact location of the water main was not fully known until we dug up the road itself, which meant that we could not share this information at the public exhibitions held in February this year.
The decision to carry out this work over the college and school holidays was taken after listening to locals who experienced delays during the last full closure.”
Meanwhile, the developer has had to replace signs which incorrectly spelt Torrisholme with one ‘R’.
The company said one sign, was missed but was due to be corrected.