Abstract: A construction piece usable, in combination with other identical pieces, for forming a toy vehicle track, having interengaging slots and studs whereby a front side of one piece may be connected to the rear side of another, with slight inclination of the pieces being possible to allow for a curved track. On one face of the piece are segments of a road type tract suitable for a toy vehicle, and from the opposite face project rectangular segments which together provide rail tracks for a toy railway vehicle; this allows the track to be used with either of the two track types uppermost. The piece also has studs projecting from its ends which can engage in sockets in like pieces to form various structures. A construction set incorporating such track forming parts may also include toy vehicles having studs or sockets which can co-operate with corresponding track parts so that complex vehicles can be made.