The Minister for Transport indicated today he will close a loophole in the law banning the use of a mobile phone while driving by the autumn.
Regulations forbidding drivers to use the phones are not being enforced by the Garda because of uncertainty over the law.
A spokesman for Mr Brennan said new legislation is in the final stages of drafting and that the Minister expected to bring it before the Dáil in the autumn.
He said mobile phone use was also one of the offences that will incur two penalty points and a fine of about €400 once the penalty points system has been fully rolled out.
Mr Brennan said last month he had been advised by the Attorney General that the present regulations prohibiting mobile phone use by drivers may be open to challenge in the courts.
Fine Gael transport spokesman Mr Denis Naughten called on the Minister to act immediately to introduce legislation to outlaw the use of mobile phones by motorists in the light of ongoing road fatalities.
In a statement issued before this afternoon's road safety debate before the Oireachtas Transport Committee, Mr Naughten said the Minister had said he intended to implement the legislation "without delay" in May.
"Research suggests that drivers using mobile phones are six times more likely to make mistakes than drivers who are not," he said.