Organised travels with a guide to the outback is popular, although some Australian and international tourists travel in their own cars. Such a trip, especially off the few big roads in the outback, requires very good planning and a suitable vehicle (usually four wheel drive). On remote routes considerable supplies and equipment are required. Some big trips cannot be undertaken safely without a convoy of several vehicles. Deaths of tourists are a regular occurrences because many people are not well-prepared for their outback trip.