curved single track and vice versa from a passing lane width to a single track width and vice versa and from a straight special width track section to a curved special width track section and vice versa y track sections permitting intersections of two tracks or as a modification entry and exit track sections permitting bicycles to enter and leave the track may be provided both in the single lane and special width categories in addition to the various track sections described above and built in conjunction with the illustrated straight sections within the drawings and described herein the next most important aspect of the track system of the present invention is the support brackets which have been discussed in some detail and are illustrated particularly in drawing fig8 and 9 it should be kept in mind that since the track sections are coupled together at right angle flanges which depend downwardly from the bottom surfaces of the molded plastic sections at opposite ends and which are bolted together when placement of the track sections onto the brackets the brackets can be aligned with flanged couplings between track sections and to a side thereof thus the lateral contact therebetween prevents the tendency for the track sections to shift in the direction of their longitudinal axis during usage the support brackets therefore cooperate with the flanged ends of the track sections to.