Public Light Buses (PLBs) are minibuses with not more than 16 seats. Their number is fixed at a maximum of 4,350 vehicles. Some PLBs are used on scheduled services (green minibuses) and others on non-scheduled services (red minibuses).

Red minibuses are free to operate anywhere, except where special prohibitions apply, without control over routes or fares. There are 1,361 red minibuses in June 2010. In year 2009, RMBs carried about 390,000 passengers daily.