Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 175 - VEHICLE EQUIPMENT AND INSPECTION
Subchapter H - MOTORCYCLES
Section 175.153 - Horns and warning devices

(a) Condition of horns and warning devices. All components of the horn or warning device shall be in safe operating condition as described in § 175.160 (relating to inspection procedure).

(b) Horn and warning device requirements. A motorcycle shall have a horn or other warning device which is audible under normal conditions at a distance of not less than 200 feet. No vehicle shall be equipped with a siren, bell, whistle or similar device emitting an unreasonably loud or harsh sound, except emergency vehicles and vehicles equipped with an anti-theft device.