The Los Angeles Department of Transportation, commonly referred to as LADOT, is a municipal agency that oversees transportation planning, design, construction, maintenance and operations within the city of Los Angeles.LADOT performs many transportation related duties, with six main operating groups: Parking Enforcement & Traffic Control, Operations, Project Delivery, Parking Management & Regulations, Transit Services, and Administration.The name DASH started as acronym for Downtown Area Short Hop, the original purpose of the service.Most Commuter Express buses are 40-foot (12 m) or 45-foot (14 m) MCI D-Series motorcoaches, offering a more comfortable ride on these longer routes.[31] Routes 419, 423, 431, 437, 438, and 448 are former Southern California Rapid Transit District lines that were transferred to LADOT.