Abstract
Test are described in which a vehicle was driven into a six-year-old hedge,20ft thick. of rosa multiflora Japonica, a Thornless Shrub rose. Three tests were made at entry angles of 900, 20 and 10° to the line of the hedge at speeds of 19,32 and 29 mile/h respectively. The Test car, which weighed 2475 1B, sustained only scratches to the bodywork. It passed completely through the hedge at the entry angles of 90 and 20 In the third test at 100to the hedge the c r came to a stand-still after travelling 54ft within the hedge, the average measured deceleration being 0.45g.The average retardation obtained from the three tests was 0.42g,which is similar to that obtained by fairly firm braking.