Abstract
It is easy to forget that, in times when technology moves so quickly, some of the latest and most cutting-edge developments have their roots deep in the past. This article briefly describes the two systems which were developed to introduce congestion charging in urban road networks. Dynamic route guidance is then discussed in detail, including information on the discussion document 'Autoguide - a better way to go?', which was designed to help drivers find the best routes to their destinations, using up-to-the-minute information on traffic conditions.