The robots, developed by French company Stanley Robotics, can park cars with centimetre-level precision. Gatwick says the system can accommodate around 95% of vehicles, although some cars are excluded. Vehicles must weigh no more than 2.6 tonnes, be under 2.3 metres tall, have a wheelbase of less than 3.3 metres and wheels no larger than 21 inches (53,34 centimètres).