passive warning devices
Defined in 1 dictionary — Case Law
Definitions from Case Law
United States Supreme Court
those types of traffic control devices, including signs, markings and other devices, located at or in advance of grade crossings to indicate the presence of a crossing but which do not change aspect upon the approach or presence of a train.
Defined by the Supreme Court in Csx Transportation Inc v. Easterwood Easterwood, 507 U.S. 658 (1993).