This is an interesting idea it’s a special set of traffic lights that are being installed for a colony of bats. The bats live in a tunnel in Oxfordshire which is also used by commuter trains. The lights are being installed as an early warning system to let the bats know when a train is approaching so that they have time to move out of the way. It is natural for bats to avoid bright light so it is hoped that the trial of traffic light system will prove successful. If it works it will enable a second train service to run between Oxford and London.