Graduated speeding fines that had already been agreed by Cabinet will now not be introduced as planned.
Transport Minister Eamon Ryan said the decision to scrap the new fines was made due to fears it would confuse motorists if they were introduced at the same time as variable speed limits on motorways.
The graduated speeding fines were agreed by the last government and would have been based on how much a motorist was over the speed limit.
The Department of Transport will now however focus on the introduction of variable speed limits on motorways in Ireland for the first time, with legislation due before the Cabinet early next month.
The M50 is reported to be the first road network to have a variety of speed limits.