49 CFR 234.225 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 200.1 To Parts 273-299) — Other Regulations Relating To Transportation (Continued) (§ 200.1 To Parts 273-299) — Federal Railroad Administration, Department Of Transportation (§ 200.1 To Parts 273-299) — Grade Crossing Safety (§ 234.1 To Appendix B To Part 234) — Maintenance, Inspection, And Testing (§ 234.201 To § 234.275) — Maintenance Standards (§ 234.201 To § 234.245) — Activation of warning system.

4 Aug 2016

A highway-rail grade crossing warning system shall be maintained to activate in accordance with the design of the warning system, but in no event shall it provide less than 20 seconds warning time for the normal operation of through trains before the grade crossing is occupied by rail traffic.

49 CFR 234.225