The Department of Transport last night said the Minister, Mr Cullen, would revisit the issue of speed limits for larger vehicles, following a spate of deaths in lorry accidents.
Two people have died in separate incidents involving heavy goods vehicles on Irish roads in the last 48 hours, bringing the total number of deaths so far this year to 17.
The number is three fewer than at this stage last year. Seven people lost their lives in December in accidents with heavy goods vehicles.
Larger vehicles, including trucks, coaches and public transport buses, were excluded from speed-limit changes as part of the conversion to the metric system.
A spokesman for Mr Cullen told The Irish Times: "We would caution against drawing conclusions from certain recent incidents in the absence of any up-to-date statistics.
"Nonetheless, any death on Irish roads is one too many. The Minister is set to revisit the limits for larger vehicles later in the year".
Gardaí at Store Street, Dublin, were last night investigating a fatal traffic collision at the East Link tollbridge shortly after 3.30 p.m. yesterday. A young man in his mid-20s was killed when his motorcycle collided with a lorry.
He was brought to the Mater Hospital where he was pronounced dead. A post-mortem examination is to be carried out today, and the scene was preserved for technical examination.
The accident caused extensive congestion for several hours yesterday afternoon. However, traffic was flowing normally last night. The man's name has not yet been released.
Elsewhere, gardaí at Abbeyleix, Co Laois, are investigating a fatal road traffic collision which happened on Wednesday shortly after 6 a.m.
The collision between a truck and a car occurred at Ballaghmore, Borris-in-Ossory. The male driver of the car, Mr Patrick Cahill (38), School Road, Lisnagry, Co Limerick, died as a result of his injuries.