Motorcycle Headlight Modulators
Print or save this .pdf version (or keep it on your smartphone) to take with you on your motorcycle in case you get stopped by the police.
This Federal law supersedes all state laws and makes motorcycle headlight modulators legal in all 50 states.
Here is the US Government Printing Office web page with all of Part 571 and all of the subsections. Also, the Legal Information Institute at Cornell University also has a nice website where you can read the various sections of the entire Title 49 USC. Code of Federal Regulations.
(Federal Motor Vehicle Safety Standards) (49 CFR Part 571.108 S7.9.4) allows motorcycle headlight modulation systems all 50 states provided they comply with the standards set forth in this section.
Title 49 USC 30103 (b1) (US Codes) prohibits any state from forbidding a system that conforms to FMVSS 108.
Click here to see the regulation.
From the U.S. Government Printing Office via GPO Access [CITE: 49CFR571.108] [Page 236-307]
TITLE 49: TRANSPORTATION – CHAPTER V, NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 571, FEDERAL MOTOR VEHICLE SAFETY STANDARDS – Subpart B–Federal Motor Vehicle Safety Standards – Sec. 571.108 Standard No. 108;
Lamps, reflective devices, and associated equipment – S7.9.4 Motorcycle headlamp modulation system.
S18.104.22.168 A headlamp on a motorcycle may be wired to modulate either the upper beam or the lower beam from its maximum intensity to a
lesser intensity, provided that:
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