Failure to fold away truck loader cranes properly all too often results in vehicles bashing the underside of bridges overhead.

Since April 1998 there has been legislation In the UK stating that all vehicles registered since 1990 must be retro-fitted with height warning indicators, with visual and audible alarms in the cab.

Among manufacturers supplying such equipment is GKD Technik, whose NoBash indicator warns the driver if crane, tipper or stabiliser legs are extended, or if PTO has not been switched off.

Four indicators show: • overall safety, when everything is correctly stowed for driving • stabiliser leg warning • PTO warning • “above horizontal” warning.

Price for the equipment starts at £145 ($230), excluding sensors.