_ activity bas decreased significantiy. 4 given dose rate reading inside « vehicle may represent less sontanination per wit area dus to the contritutien of gamma radiation from the exterior ef the vehicle. wuld more Om the other hand, contamination vithin a vehiels probably be picked up by persaunel than if it vere on the cutaide. Further, it is reecgrised that significantly high concentrations ef redic~ active fallout may accumulate in such parts as the air filters of on automobile. Again, this has to be veighted egainst the probability that they will be handled before the activity nas decreased te low levels plus the fact that it is relatively difficult t« monitor sueh parte an a mass basis. The uncerteinties present in estimating possiblehasards from vehiale contamination would mot Justify Cine distinctions in monitoring the various parts. 4 thorough cleaning, inside anc outeide, would appear to be the best solution. One of the obvious ways to evold such of the problem diseussed in Folicy IV in to prevent vehicles entering an area during the tine of fallout. Thiz will not prevent the first vehicles passing through frompicking up activity on the tires fros the highway. [t is beliewed, however, this will not constitute suat a troublesome problem and pest experience has indicated that the aetivity found on the tires noticeably decreased after several ears had passed ower the highvay. Purther, (ff vehicles are not present in the fallout it will help reduce contaminati>r o” the passengers and of the insides of the vehicles. Ucaccirien Dne ae yco ? :