A common form of transportation in Cambodia (commonly used in cities) is the tuk tuk or the remork-moto. The tuk tuk is very similar to a taxi; it is a carriage attached to a bike in which someone pulls through the cities.
While the tuk tuk is mostly prevalent in urban cities, many citizens have motorbikes in which they use in both urban and rural areas. These are found in bulk (especially around cities) because they are cheaper than other modes of transportation, namely cars.
Cambodia also uses carriages pulled by animals, taxis, and outboards (boats that usually provide transportation on rivers). However, the public transportation is not universal or super well organized.
Sources:
http://www.lonelyplanet.com/cambodia/transport/getting-around/local-transport
Cambodia: 