According to statistics gathered in 2008 by the National Highway Traffic safety Administration (NHTSA), over 60,000 pedestrians were injured in traffic accidents in the USA [2]. When a pedestrian is struck by a car moving at a speed of 35 miles per hour, the injuries are likely to be fatal as a result of the impact of the pedestrian's head with the windshield or the frame of the car. A team, led by crash specialists at Cranfield University, has devised a new design of an external airbag which is fitted under the hood [4]. Unlike other airbags that are designed to protect the driver and passengers, this system is purely aimed at improving the pedestrian safety.