LGW has RETILS (Rapid Exit Taxiway Information Lighting System) installed on it's RETs. They provide a 3-2-1 countdown of lights/paint markings spaced 100m apart starting at 300m from the start of the exit point. Runway occupancy data before and after installation confirm they have reduced runway occupancy times since being introduced.
STN intend to introduce the same on it's RETs.
It helps when designing runway exits that they are in the correct location which suits the type of traffic using the runway therefore reducing runway occupancy. Busy airports with long runways which have a mix of small, medium and heavy traffic should provide 3 exits with the first at around 1400-1500m, second around 1800-1900m and third around 2100m from the landing threshold to help make best use of the runway.