privatization throughout the 2000s have always been strongly opposed by the union and have not made any progress. There are two active rail links to adjacent countries. The line to Malaysia uses the same gauge, as does the line to Laos across the Mekong River on the First Thai-Lao Friendship Bridge. The line to Cambodia is currently disused and is being rebuilt, while the line to Myanmar is defunct (see Death Railway). A projected extension will rebuild the route and in 2011 a link was also proposed from Kanchanaburi to Port Dawei. Rail transport in Bangkok includes long-distance services, and some daily commuter trains running from and to the outskirts of the city during the rush hour, but passenger numbers have remained low. There are also three rapid transit rail systems in the capital. Rail rapid transit systems Bangkok Metropolitan Region Bangkok is served by three rail rapid transit systems: MRT, with two lines. Bangkok Skytrain or BTS, with two lines. Suvarnabhumi Airport Link or ARL, with one line. Khon Kaen In March 2016, the Thai government approved the first LRT project in Khon Kaen province, to be built by the private sector. The first phase of the project will be a 26 km North-South route. Previously, this corridor was intended to be served by a bus rapid transit route. The Office of Transport and Traffic Policy (OTP) will fund an 8-month project study for Khon Kaen University with 38 million baht. The Khon-Kaenpattanmong or Khon Kaen Think Tank, a private company, will be the main investor in the project and responsible for the operation of the network. The Phase 1 budget is estimated at 1.5 billion baht. As of 2020, construction has yet to start. Other Provinces Several other rapid transit systems have been proposed but have not been approved : Chiang Mai monorail, Pattaya LRT, Phuket LRT and Hat Yai monorail. Road transport Thailand has 390,000 km (242,335 miles) of highways. According to the BBC, Thailand has 462,133 roads and many multi-lane highways. Thailand had 37 million registered vehicles, 20 million of them two or three-wheeled motorbikes, and millions more that are unregistered. It also had one million "heavy trucks", 158,000 buses, and 624,000 "other" vehicles. By mid-2019 the number of registered vehicles in Thailand had risen to 40,190,328. The majority—21,051,977—are motorbikes. Private automobiles with up to seven seats numbered 9,713,980. Road safety According to the World Health