The Harbor Police Department has a number of vehicle units assigned to patrol the runway and ramp areas as well as the parking lots and frontage roads of the San Diego International Airport, Lindbergh Field. They respond to radio calls and emergencies in and around the airport and provide assistance to officers on foot in the terminals. During emergencies involving aircraft, they transport officers to pre-assigned positions, escort the responding fire department and emergency services vehicles to the aircraft once they are on the ground and assist on scene. The vehicle units also perform random security checks in the secured areas of the airport and assist with traffic when there is a high volume of people traveling to and from the airport.