Title 23 › Chapter CHAPTER 1— - FEDERAL-AID HIGHWAYS › § 166
Public authorities that run HOV lanes must set how many people must be in a vehicle to use them. At least two people per vehicle can be required unless exceptions apply. Motorcycles and bicycles may use HOV lanes unless the authority shows to the Secretary that they create a safety hazard and the Secretary agrees after public notice and comment. Public transit vehicles may use the lanes if they can be clearly identified, rules can be enforced, and all public transit and over-the-road buses get equal access. Authorities may let other vehicles use HOV lanes if drivers pay a toll under a program that lets people enroll, automatically collects tolls, varies prices to manage demand, and enforces violations. Before September 30, 2025, authorities may allow alternative fuel vehicles and the vehicles described in section 30D(d)(1) of the tax code if enforcement procedures exist. Before September 30, 2019, labeled low-emission, energy-efficient vehicles could use the lanes with a toll under a selection and enforcement program. Blood transport vehicles going between collection points and hospitals or storage centers may use HOV lanes if clearly identified. Tolls are allowed under federal rules and the toll revenue must follow section 129. If an authority allows tolled or other non-HOV vehicles, it must report to the Secretary that the lane is not already degraded and must monitor and enforce performance. The authority must limit or stop non-HOV access if the lane becomes degraded. “Degraded” means the lane fails to meet a minimum average operating speed 90 percent of the time over a consecutive 180-day period during weekday peak hours. The minimum average speed is 45 miles per hour for lanes with speed limits of 50 mph or higher, or no more than 10 mph below the speed limit for lower-speed lanes. If a lane is degraded, the authority must submit a fix-up plan within 180 days (for example, raise occupancy, change tolls, stop non-HOV use, or add capacity); the Secretary will approve or disapprove the plan within 60 days. The Secretary can impose sanctions until the lane is fixed but may waive them if certain conditions are met. The EPA Administrator must issue rules within 180 days after enactment to certify and label low-emission, energy-efficient vehicles. Key defined terms: alternative fuel vehicle — runs on fuels like electricity, hydrogen, natural gas, ethanol, LPG, or other non-petroleum fuels; HOV facility — a high-occupancy vehicle lane or facility; low-emission and energy-efficient vehicle — must meet Tier II emission standards and show at least a 50-percent city or 25-percent combined fuel-economy gain (or be an alternative fuel vehicle); over-the-road bus — as defined in the ADA; public authority — the state, compact, public entity, or local government that runs the facility; public transportation vehicle — buses or school vehicles that provide designated public transit and are owned, contracted, or licensed to serve the public. If a tolled HOV lane is on the Interstate in a metropolitan planning area, the authority must consult the metropolitan planning organization about where and how much to toll.
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Highways — Source: USLM XML via OLRC
Legislative History
Reference
Citation
23 U.S.C. § 166
Title 23 — Highways
Last Updated
Apr 6, 2026
Release point: 119-73