liquid spray from the pipe 30 radially inward from the curved pipe 30 toward a vehicle as shown in fig3 and 4 the spray pattern is shown by the curved lines 48 increasing in size from each of the nozzles by directing the nozzle spray radially inward the nozzles are always directed toward a passing vehicle such as a large van type vehicle 50 shown in fig3 as well as a shorter car 52 as shown in fig4 regardless of the vehicle 39 s size the liquid spray is always directed toward the vehicle 39 s surface while the shorter car 52 is further from the upper nozzles of the arch as the distance from the nozzles increases so does the extent of spray overlap the spray overlap results in each unit area of the smaller vehicle 39 s surface receiving a greater quantity of liquid than the larger vehicle 50 the increased quantity of liquid per unit area at least partially compensates for the increased distance from the nozzle with reference to fig2 a spray arch 10 39 is shown the arch 10 39 is essentially identical to the arch 10 with the provision of a pair of pipes 30 each carrying a plurality of nozzles 46 the provision of two pipes can provide for a greater quantity of wash fluid to be discharged onto the vehicle in addition the nozzles 46 on one pipe 30 can be oriented slightly upstream while the nozzles 46 of the other arch oriented somewhat downstream relative to the vehicle path this enables.