DRIVERS may think twice about buying a car if three bills are passed allowing the Government to raise vehicle and road taxes at any time. The Executive Council will introduce the bills to the Legislative Council next month to facilitate increases of annual car licence fees and passage tax on the cross-harbour tunnel. Tax concessions for company cars may also be removed. The bills come after measures proposed by the Transport Branch last summer to tackle congestion. The branch's proposal to raise the $10 tunnel toll to $30 as a short-term measure was rejected by Exco, who allowed the amendment of existing laws so that changes could be made in future. The members also agreed to prepare laws for the increase in annual licence tax. That is if the rate of car growth exceeds an acceptable level. The bills include the Road Traffic (Amendment) (No 3) Bill 1995, the Eastern Harbour Crossing Road Tunnel (Passage Tax) Bill and the Inland Revenue (Amendment) (No 4) Bill 1995.