Self illuminating, solar-powered road studs have been installed for the first time on a UK trunk road. The studs are on a stretch of the A449 between Worcester and Kidderminster. The new studs, which cost around 10 times as much as the standard article, can be recharged by car headlight beams as well as daylight and can operate for several nights on a single charge. According to the Highways Agency the studs are used only near junctions and tight corners to improve safety during fog and rain. Accident rates on the A449 will be monitored for three years to see if brighter cats eyes improve safety in adverse weather conditions.