Transport in Malaysia started to develop during British colonial rule, and the country's transport network is now diverse and developed. Malaysia's road network is extensive, covering 63,445 km, including 1,630 km of expressways. The main highway of the country extends over 800 km, reaching the Thai border from Singapore. The network of roads in Peninsular Malaysia is of high quality, whilst the road system in East Malaysia is not as well developed. The mainmodes of transport in Peninsular Malaysia include buses, trains, cars and to an extent, airplanes.Malaysia has six international airports. The official airline of Malaysia is Malaysia Airlines, providing international and domestic air service alongside two other carriers. Most of the major cities are connected by air routes. The railway system is state-run, and covers a total of 1798 km, in Peninsula Malaysia only. Popular within the cities is Light Rail Transit, which reduces the traffic load on other systems, and is considered safe, comfortable and reliable.