Corp. Clayton W. Hamberger, right, and Trooper Eric A. Bornemann of the Pennsylvania State police pose with a radar machine on the fender of their car underneath a newly erected radar speed check sign on route 30 near York, Pennsylvania on June 30, 1960. A motorist can not be arrested on the basis of a radar check but State Police are using the electronic device to single out speeding motorists for warnings. (Photo by Paul Vathis/AP Photo)
