49 CFR § 222.45
When is a railroad required to cease routine sounding of locomotive horns at crossings?
November 18, 2020
On the date specified in a Notice of Quiet Zone Continuation or Notice of Quiet Zone Establishment that complies with the requirements set forth in §222.43 of this part, a railroad shall refrain from, or cease, routine sounding of the locomotive horn at all public, private and pedestrian grade crossings identified in the Notice.