OAR 741-110-0080
OAR 741-110-0080. Observance of Railroad Stop Signs
When Railroad STOP signs are installed, traffic on the railroad shall stop prior to entering the roadway and proceed when safe to do so, but not before automatic gate arms have fully lowered, or (in the case of a highway-rail grade crossing not equipped with automatic gates) not before active protective devices, if any, at the crossing have been fully activated for a period of not less than 20 seconds.