Tibet is relatively undeveloped compared to the rest of China and, as such, does not have much in terms of public transportation infrastructure. Despite considerable plans for development, it is unlikely that public transport in Tibet will improve significantly any time soon. Public transport is not really a concern for travellers, however, as they are required to organise their itineraries through tour operators and should at all times be accompanied by a guide and driver when exploring Tibet. Tourists are prohibited from traveling outside Lhasa independently. The Tibet Transportation Co-Op is the government-approved option for car rental and 4x4 vehicles are the most popular choice. For package tours with big groups the cost of the vehicles is invariably included but individuals and small groups on private tours may need to organise car rental themselves. Either way, their tour operator should advise them.