A toy car race track set comprised of a plurality of easily connectible track sections, in which the track sections have novel provisions for integrating the track sections with structures formed with K'NEX rod and connector elements, including but not limited to structures for elevating track sections above a support or above other track sections, providing obstructions on the race course, and the like. A variety of shapes and forms of track sections enables a substantially limitless variety of track configurations to be assembled. Each section is provided at each end with at least one tongue element and one slot element positioned such that the tongue element of one section is received in the slot of an adjacent section with a desired, snap-in action substantially preventing unintended separation. Optional locking pins are provided for positively locking the track sections to other sections when desired.