The overall goal with the EDDIT programme is to find out whether different ATT systems can enhance personal security and extend safe driving among elderly drivers. Two systems developed to enhance visibility during night-time driving were tested: the Volvo ultraviolet light system and the Jaguar night vision system. Both systems have a positive effect on the visibility of pedestrians and on road design elements. It appears likely that using these systems would give older drivers more confidence when driving at night and should improve both their own safety and that of other vulnerable road users such as pedestrians. (A) For the covering abstract see IRRD 868006.