Thousands of motorists caught breaking M54 speed limit
More than 5,000 motorists have been caught speeding on Staffordshire's M54 since a 50mph speed limit was introduced in May.
The speed limit is in force for at least a year as work starts to build a new and extended junction 2 by the Staffordshire-Wolverhampton border.
Staffordshire County Council said the number of fixed penalty fines issued goes up at the weekend.
Mark Winnington from the council said speeding raised safety concerns.
"The 50mph limit is in place to protect the safety of people working at the site, but also to protect motorists along a stretch of the motorway where the lanes have been narrowed," Mr Winnington said.'Not the culprits'
"Even when the workforce isn't visible on the roadside, it is still essential motorists stick to the speed limit to ensure they aren't endangering themselves and other motorists.
"Any money collected from fines goes straight to central government, so it is not in our interest to issue them."
Since enforcement started in May, 5,200 vehicles have been caught breaking the 50mph speed limit, the council said.
The number of fixed penalties issued went up at the weekend, suggesting commuters were not the main culprits, Mr Winnington said.
The work on the new junction is due to be completed by 2014.