Driverless vehicle with proportional drive

A driverless vehicle comprising a deck, means including one substrate below a portion of the deck, support wheels coupled to said deck and adapted to ride on tracks, a drive wheel adapted to be driven by a centrifugal drive tube, a mount, said drive wheel being supported from the substrate by said mount for rotation about a horizontal axis, said mount and drive wheel being coupled to said substrate so as to be pivotable about an upright axis between a drive position and a stop position, means including assemblies coupling said deck to said substrate and support wheels so that the downward force transmitted from the deck to the substrate varies with the load on the deck with only a portion of the load being transmitted directly to the drive wheel and the remainder of the load being transmitted to the support wheels thereby controlling the force between the drive wheel and the drive tube to be in driving frictional contact therewith.