Cheaper Vehicle Excise Duty for non-motorway users?
The drive for cleaner motoring has resulted in modern cars emitting far less fumes but the knock-on effect of that is that people are paying less in vehicle tax.
A two-tier Vehicle Excise Duty, with a lower rate for those avoiding motorways and other main routes, is among options being considered by the government.
The plans would not necessarily mean those using motorways pay more than at present, a Treasury source said.
Charlotte Leeming reports.