On the surface of the airport, there are Runways for landing and taking off of aircraft. At night they are lighted by runway lights. White lights along sides of the runway are used to mark the width and length of the runway. There are also Approach Lights used to lead the aircraft towards the runway and Threshold Lights which mark the beginning of the runway. Taxiways are also lighted with blue lights to help aircraft taxiing to and from the runways. At the end of the runways, there are stop-ways and turn-around areas. There are Parking Aprons where the planes are loaded and unloaded and where passengers embark and disembark.