Citroën wanted to create a four wheel drive car for use in africa to take the rugged terrain encountered during oil and mineral exploration. Instead of going with a standard configuration, Citroën mounted one engine in the front and one engine in the rear to create four wheel drive. Separate ignition switches control the engines. On the road, you can drive with both engines running giving you a top speed of 60 mph. You can also drive on the front engine only but the top speed is reduced to 35 mph. Because of its light weight (1600 pounds) and 50/50 weight distribution, it has great off-road capabilities. Note the car has two gas tanks–one under each front seat. The 2CVs were made in many variations, and the Sahara is one of the rarest models. Only 694 Saharas were made and only about 100 are thought to survive.