Abstract: An assembly-toy chassis building element for a toy vehicle has at least one side wall that is configured for being releasably interconnected with a particular wall of another building element of the toy vehicle. Each end wall of the chassis element includes at least one groove that is compatible with tongues in other building elements in a set of compatible toy building elements so that a compatible toy building element can be interconnected to the end walls of the chassis element. A wider toy vehicle can be assembled by side-to-side coupling of two chassis elements via an intermediate building element having compatible side walls. A longer toy vehicle can be assembled by end-to-end coupling of two chassis elements via an intermediate building element having compatible end walls.

Abstract: An assembly-toy chassis building element for a toy vehicle has at least one side wall that is configured for being releasably interconnected with a particular wall of another building element of the toy vehicle. Each end wall of the chassis element includes at least one groove that is compatible with tongues in other building elements in a set of compatible toy building elements so that a compatible toy building element can be interconnected to the end walls of the chassis element. A wider toy vehicle can be assembled by side-to-side coupling of two chassis elements via an intermediate building element having compatible side walls. A longer toy vehicle can be assembled by end-to-end coupling of two chassis elements via an intermediate building element having compatible end walls.