49 CFR Appendix B to Part 234: Appendix B to Part 234—Alternate Methods of Protection Under 49 CFR 234.105(c), 234.106, and 234.107(c)

[This is a summary—see body of text for complete requirements]

Flagger for each direction of traffic Police officer present Flagger present, but not one for each direction of traffic No flagger/no police

False Activation Normal Speed Normal Speed Proceed with caution—maximum speed of 15 mph Proceed with caution—maximum speed of 15 mph.

Partial Activation* Normal Speed Normal Speed Proceed with caution—maximum speed of 15 mph Proceed with caution—maximum speed of 15 mph.

Activation Failure** Normal Speed Normal Speed Proceed with caution—maximum speed of 15 mph Stop: Crewmember flag traffic and reboard.

*Partial activation—full warning not given.

Non-gated crossing with one pair of lights designed to flash alternatively, one light does not work (and back-lights from other side not visible).

Gated crossing—gate arm not horizontal; or any portion of a gate arm is missing if that portion had held a gate arm flashing light.

**Activitation failure includes—if more than 50% of the flashing lights on any approach lane not functioning; or if an approach lane has two or more pairs of flashing lights, there is not at least one pair operating as intended.