The Netherlands and Portugal have this month introduced differentiations into their car registration taxes to encourage car buyers to opt for the cleanest models.
The vice-president of the European Investment Bank (EIB) says major transport investment projects have to be accompanied by some form of road charging.
Thirteen nations have agreed to sign up to Jacques Chirac’s forthcoming tax on air tickets to help development and fight disease in the developing world.
Stockholm introduced its congestion charge last month, with an immediate drop in car journeys, a decrease in journey times, and a shift onto public transport.