N.H. Code Admin. R. Saf-C 1308.13
Each school bus shall be equipped with a horn which is capable of producing a reliable warning signal that can be heard 200 feet from the bus.
Source. #8248, eff 1-4-05 (from Saf-C 1307.13); ss by #10439, eff 10-11-13 (see Revision Note #1 at chapter heading for Saf-C 1300); ss by #14005, eff 6-22-24, EXPIRES: 6-22-34 (see Revision Note #2 at chapter heading for Saf-C 1300)