Opposition transport spokesman Alistair Coe has issued a statement accusing "ACT Labor" of "cashing in" on confusion around the speed limits on William Hovell Drive.

However, Police Minister Simon Corbell has revealed that not a single driver had been booked for speeding on the road since the speed limits were changed a month ago, labelling Mr Coe's claims as "outrageous".

The speed limit on William Hovell Drive was permanently reduced more than a month ago from 90km/h to 80km/h on the section between the Coppins Crossing Road intersection and 500m east of the Bindubi Street intersection.

But Territory and Municipal Services (TAMS) bureaucrats admitted that they made a mistake in not giving motorists proper warning of the changes.

Mr Coe claimed today that there was a speed camera van operating on William Hovell Drive yesterday and demanded that drivers caught speeding by the van should be excused from paying the penalty.

ACT Government employees operate the vans, but their location is determined each day by ACT Policing and the Traffic Camera Office.

"Last month, the Government responded by admitting they made a mistake by failing to give Canberrans notice of the reduction," Mr Coe said.

"However, just one month on, they're now cashing-in on that mistake

"By already sending a mobile speed camera van to this part of William Hovell Drive is dishonest, and on the verge of entrapment.

"It shows that once again, the ACT Labor Government is out-of-touch with community expectations."