header bg

Question:

At railroad crossings which have the standard octagonal, red-and-white stop sign, drivers must stop and proceed only when

A
Explaination

At crossings marked with automatic flasher units or automatic crossing gates, drivers must stop if the lights are flashing or the gates are lowered, and remain stopped until the lights stop flashing and the gates are raised. At crossings which have the standard octagonal red-and-white stop sign, drivers must stop and proceed only when they determine no train is approaching.