UK-based Trafficmaster Plc is developing an in-car vehicle navigation system called T-nav which combines an ‘off-board’ server based routing system with the company’s current live traffic flow data information. Trafficmaster claims T-nav is unique because it takes into account current and forecast traffic conditions. Once a driver has logged a chosen route with the T-nav call centre, using a mobile telephone, a route-guard service is automatically provided, watching the route ahead and sending an automatic alert should traffic problems be noted.