It will be launched following a review of road user charging schemes currently operating in London and Durham.
Transport Minister David Jamieson told the House of Commons: 'We will consult on the scope of a uniform minimum standard of exemptions and concessions once we have had an opportunity to take into account the experiences gained from London and Durham charging schemes.
'In the meantime, it is a matter for those local authorities developing charging schemes to decide how to manage such vehicles within their schemes.'
Pressed on how any future congestion charging scheme would treat motorcycles, which are currently exempt from the London congestion charge, Jamieson added: 'With the help of the Advisory Group on Motorcycling, the Government is exploring a number of issues relating to the role of motorcycling in an integrated transport policy, including congestion. The key workstreams should be completed by 2004, when we aim to determine a strategy for motorcycling.'