New speed limits for the State's roads will come under discussion in the Dáil this afternoon when the new Road Traffic Bill comes before the House.
The Bill proposes changing speed limits to kilometres per hour, a requirement of EU legislation.
Some limits are expected to be rounded up slightly, while others will be rounded downwards in built-up areas.
A number of proposed changes to speed limits in certain areas in Dublin, as suggested by a consultation group with input from groups such as the AA, have effectively already been rejected by local authorities.
It is believed the Minister for Transport, Mr Cullen, does not plan to bring in random breath testing for drivers. His predecessor, Mr Seamus Brennan, said last year such tests would be legislated for in the Bill.