A vehicle roll control system uses two accelerometers (28,30) on the vehicle to detect body roll and then filters out higher frequency roll movements as indicative of a rough road surface. The system also monitors vehicle speed, and increases roll stiffnes...

A security system is disclosed for a motor vehicle having a telecommunications system (22,.40) and a remote locking system (34). A transmitter (36) is provided for transmitting a distress signal at the frequency of the remote locking system when an alarm c...

In a vehicle braking system with electronic brake distribution the threshold level of slip of the rear wheels 14a, 14b is increased when the front brake temperature is estimated to have increased to a level where brake fade will occur. This allows more bra...

A vehicle air suspension system includes a control unit 32 which is arranged to measure the level of articulation of the two axles 18, 20 and, if it exceeds a certain level, to open respective interconnections 34, 36 between the suspension units 24 on oppo...