The Minister for Transport is to unveil details of this year's €1.2 billion road-building programme and will outline progress in work on a motorway network linking the State's major cities.
Mr Brennan and the National Roads Authority (NRA) will give a rundown on which road projects will begin in 2004 and update on the progress of others under way.
The Minister has €1.227 billion for investment this year and more than €7 billion over the next five years.
In December, Mr Brennan announced a major revision of the timetable for the building of motorways from Dublin to Cork and Galway. The revision will see both routes "substantially completed" by 2007.
The Government decided that at least three motorways should be substantially completed by 2007 - just one year off the original target in the National Development Plan 2000-2006.
Mr Brennan said the prioritisation of the three routes over the next five years would not cause other road projects to be delayed.