The angle of RET may also affect exit speed. Stansted for example has two RETS serving both runway directions but the first RETs (original design) are a 30 deg angle and the second RETs (newer design) are 25 degs with wider entry from the runway to facilitate faster exit speeds. Gatwick has similar angle differences on some RETs. As mentioned, providing distance to go markings/lighting (RETILS), particularly on busy runways, can help pilots plan the exit speed more effectively therefore reducing runway occupancy times. Trials have been carried out which confirm this.