The San Ysidro Port of Entry (aka San Ysidro Land Port of Entry or San Ysidro LPOE) is the largest land border crossing between San Diego and Tijuana, and the fourth-busiest land border crossing in the world (second-busiest excluding the crossings between Mainland China and its two Special Administrative Regions) with 70,000 northbound vehicles and 20,000 northbound pedestrians crossing each day, in addition to southbound traffic. It connects Mexican Federal Highway 1 on the Mexican side with Interstate 5 on the American side. The San Ysidro Port of Entry is one of three ports of entry in the San Diego–Tijuana metropolitan region. Gateways There is a northbound and southbound vehicle crossing, as well as two separate bidirectional pedestrian crossings. Northbound vehicle crossing There are currently 34 northbound vehicle lanes to cross from Mexico to the U.S. Southbound vehicle crossing (El Chaparral) The southbound lanes of Interstate 5 which take vehicles into Mexico have been moved west of their previous location through the new El Chaparral Point of Entry (). This relocation and expansion was necessary to provide space for the construction of new administrative and border inspection facilities and to increase the number of northbound vehicle lanes. The El Chaparral gateway also has a vehicle and passenger inspection station at which U.S. officials may conduct inspections of southbound traffic, and provides for more thorough inspection of southbound traffic by Mexican officials. El Chaparral was the name of the Tijuana border crossing prior to the 1983 modifications. Eastern/main pedestrian crossing Pedestrians may cross northbound immediately east of the northbound vehicle crossing. As of May 2017 they are temporarily processed in the Milo building while a new facility is built to the west. There are currently 15 pedestrian lanes, and more will be added with the current expansion project. The eastern (main) southbound pedestrian crossing is east of the northbound crossing, immediately south of the San Ysidro trolley station. Pedestrians pass through the 6.9-million-dollar, three-story Puerta Este México-San Ysidro building, opened in August 2015, containing Mexican passport control and customs which since late 2017 exits to a path leading to Frontera street just southwest of Ferrocarril street. Prior to 2012 the southbound pedestrian crossing was west of the northbound vehicle crossing and exited to a bridge leading to Plaza Viva Tijuana. PedWest (western pedestrian crossing) The PedWest pedestrian crossing is located at the east side of the Las Americas outlet mall where