AIA chairman Alan Mackenzie said emergency funding from the Government would be "welcome" when dealing with potholes, but spending money "here and there" makes "little difference."
He added that the £215 million announced in the autumn to improve road conditions "doesn't even cover the £338 million" of repair needed from last year's rainfall.
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On the day of the race, the fundraising website went down due to a rush of last-minute donors.
The device was found outside the gates of Holy Cross Boys' Primary School in Belfast.
The Liberal Democrat leader has been attacked after he refused to say that he does not believe gay sex is a sin.