Using motorways would cost more in road tax under plans being considered by the Government.
According to newspaper reports, ministers are considering a two-tier system with those who agree not to use trunk roads paying less.
The idea is part of review of road funding as the Treasury faces a budget shortfall caused people switching to smaller cars which are taxed at lower rates.
Automatic number plate recognition cameras could be used to catch those using motorways without paying the higher rate.
Other ideas under consideration include replacing annual road tax with a one-off charge on new vehicles.
A Department for Transport spokesman said: "The department and Treasury are currently carrying out a feasibility study to review new ownership and financing models for the strategic road network.”