Opponents of lock box for road money in Illinois say it may sound like a good idea, but they warn the proposal may cause more harm than good. Voters will decide next month on a constitutional amendment that would hold about 600-million dollars a year for only road construction. Opponents like the Civic Federation say taking the money out of the state budget will only make Illinois' finances worse. The opponents say if you want better roads, tell your lawmakers to vote for road projects. They say there's no need to change the constitution.