Truck Mounted Attenuator, TMA. on a heavy truck with brakes applied on all wheels. TMA is required in Sweden at temporary road works to protect both road users and workers. Therefore, numerous TMA vehicles are available for hire and may be used to protect crowds against sick or evil drivers. Estimates indicate that a 24000 kg truck like this could have stopped the 12000 kg truck used in Stockholm on April 7 within a braking distance of less than 10 meters.
The April 7 terror attack in Stockholm became more dangerous due to roadblockers in the Drottninggatan street. A strike by a 12000kg truck at 70km/h may eject an unrestrained 1000kg concrete block at 100km/h.
Well anchored stationary devices may stop the truck chassis, but if the barrier is too stiff, truck parts will become separate projectiles threatening people downstreams, like in the video below.
