When driving a vehicle with empty cargo tanks that are used to carry hazardous materials, the driver:
Can cross railroad tracks without slowing or stopping.
Needs to slow when approaching railroad tracks, but is not required to stop.
Must stop at railroad crossings before proceeding.
Should never drive over railroad tracks.
A vehicle with tanks that are used to transport hazardous materials must always be stopped before being driven over railroad tracks, even if the tanks are empty.