49 CFR 671.37: Good faith safety challenge.

(a) Written procedure. Each RTA must document its procedures that provide to every roadway worker the right to challenge and refuse in good faith any assignment they believe is unsafe or would violate the RTA's RWP program.

(b) Prompt and equitable resolution. The written procedure must include methods or processes to achieve prompt and equitable resolution of any challenges and refusals made.

(c) Requirements. The written procedure must include a requirement that the roadway worker provide a description of the safety concern regarding on-track safety and that the roadway work group must remain clear of the roadway or track zone until the challenge and refusal is resolved.