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All-wheel-drive highway trucks with a “flexible” or hydrostatic drives are lately coming into increasingly wide use. These trucks are provided with step-less control of power supplied to the wheels, something that improves the traction and velocity performance, conserves fuel and reduces the environmental impact of these vehicles. This article presents principles of design and layouts of systems for controlling “flexible” transmission of power to AWD highway trucks. It presents relationships defining the optimum distribution of power to the driving wheels of the AWD vehicle that allow obtaining optimum traction and minimum power losses. The methods described in the article make it possible to control the distribution of power between the wheels of a vehicle with any number of wheels.