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HB 859

Traffic Safety - As enacted, defines "fully enclosed" as having side panels, a roll bar or roof, and a windshield with regard to crash helmet requirements not applying to autocycles that are fully enclosed. - Amends TCA Title 55.

114th Regular Session (2025-2026) Introduced by Becky Jo Alexander

Tennessee exempts operators of fully enclosed autocycles (with side panels, roll bar/roof, and windshield) from mandatory helmet requirements while maintaining helmet rules for open autocycles.

Pub. Ch. 197
#trafficsafety
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WeVote Research Nonpartisan
Bill Summary · HB 859

Legislative bill overview

HB 859 amends Tennessee's traffic safety code to define "fully enclosed" vehicles as those with side panels, a roll bar or roof, and a windshield. Under this definition, operators of fully enclosed autocycles are exempt from wearing crash helmets, whereas operators of open autocycles remain subject to helmet requirements.

Why is this important

This law directly affects autocycle operators' safety obligations and creates a regulatory distinction between vehicle types based on structural features. The exemption impacts both individual compliance requirements and potential liability considerations for riders and manufacturers of enclosed three and four-wheeled vehicles.

Potential points of contention

  • Safety concerns: Critics may argue that helmet exemptions based solely on vehicle enclosure contradict crash protection data, since enclosed cabins do not eliminate head trauma risks in all accident scenarios
  • Regulatory consistency: The definition may create ambiguity about borderline vehicles—those with partial enclosures or non-standard configurations—leading to enforcement inconsistencies
  • Fairness questions: Operators of traditional motorcycles (which cannot be "fully enclosed" by definition) remain required to wear helmets, raising equity concerns about different safety standards for similar vehicle classes

Compiled from official sources — confirm details with the bill’s official record.

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