An engine fitted across the axis of a motor vehicle.

A trapezoid (in North America) or trapezium (in Britain and elsewhere) is a quadrilateral two of whose sides are parallel to each other. Some authors define it as a quadrilateral having exactly one pair of parallel sides, so as to exclude parallelograms. It is the shape made by the linkages in an Ackerman steering system.

The surface of a tire that contacts the road surface and is cut to aid traction and dispel moisture.

The surface of a tyre that contacts the road surface and is cut to aid traction and dispel moisture.

The dimension between the centres of the road wheels on one axle. Also known as track.

A switch that is operated by movement of a vehicle. Used in alarm system.

A basecoat, followed by a transparent or translucent mid-coat, followed by clearcoat; to provide a special colour effect on the vehicle.

A constant velocity joint consisting of three drive pins and balls set in three axial tracks.

A very slow charge rate for a battery. Usually 1 or 2A overnight.

A measurement taken from a fixed point on the vehicle body to the centre of the wheel.