RCW 46.63.240
RCW 46.63.240: Automated traffic safety cameras—Railroad grade crossing violations.
(1) Automated traffic safety cameras may be used to detect railroad grade crossing violations, subject to RCW 46.63.220 . (2) Automated traffic safety cameras at railroad grade crossings may be used only to detect instances when a vehicle fails to stop when facing an activated railroad grade crossing control signal.