Abstract
The present route information system is capable of improvement in various respects.The various sources of information must be better attuned to one another, and distribution should be more even. A relatively large amount of prior knowledge is needed before signposting can be used effectively. The amount of information which drivers have to assimilate must be kept within realistic limits. This applies both to information to be assimilated before the journey and to information fed to drivers en route. As far as possible route information should not compete for the driver's attention with the information he needs to keep the vehicle on the road and to carry out