Track system for toy vehicles

A track system for toy vehicles with straight and curved track pieces which are designed for detachably mounting to a base plate provided with coupling members in a uniform square grid having a building module, m, said track pieces having at the ends thereof, fixed reference points corresponding to a pair of symmetry points of a predetermined square track grid which is uniformly oriented with respect to the grid of the base plate and which is provided with a track module, M, which is a multiple of the building module, m;

• wherein each curved track piece comprises a longer arcuate segment and an adjacent shorter straight segment, the center of the arcuate segment being displaced from the center of an arc defining an angular range of the curved track piece and having said center in a symmetry point of the track grid, said arc being defined by a pair of radii extending through said pair of symmetry points of the track grid to which said fixed reference points of the curved track piece correspond, and said deplaced center of the arcuate segment being defined by the intersection of the angle bisector of the tangents (T) of said arc at said reference points of the curved track piece and one of the two radii of said arc;
• and, wherein the length of each straight track piece is in a fixed relationship with the track module, M.