Arizona Truck Lane Restrictions

Arizona can push heavy trucks into specific lanes, but only where it's signed. If your declared gross weight tops 26,000 pounds, you have to use the lane ADOT or a local authority marks for you (A.R.S. 28-736). No signs, no restriction. The general keep-right rule still applies statewide. A violation is a civil traffic ticket, running a few hundred dollars once court surcharges are added.

Rule typePosted only

The ruleEnabling rule, posted-only. A motor vehicle or combination with a declared gross weight over 26,000 pounds

FineCivil traffic violation. Base fine plus mandatory state surcharges; totals run to roughly $250-$375 depending on the court that writes the ticket.

StatuteA.R.S. 28-736

01 The rule

Which lanes a truck can use in Arizona

02 Where & when

Roads, exceptions, and signs

Where it applies: Wherever ADOT or a local authority has run a traffic study and posted lane-designation signs. No statewide blanket left-lane ban.
Posted-only. The restriction is enforceable solely where designation signs are erected.
General rule: A.R.S. 28-721 — drive on the right; slower traffic keep right, applies to all vehicles.
Conditional/posted restriction — enforceable only where signs are up, unlike Utah's by-weight statutory ban. Statute text verified verbatim; the fine varies by court, so treat the dollar figure as approximate.

03 Penalties

What a lane violation costs

Civil traffic violation. Base fine plus mandatory state surcharges; totals run to roughly $250-$375 depending on the court that writes the ticket.

Arizona Truck Lane FAQ

Can a truck drive in the left lane in Arizona?

Not as a cruising lane. Enabling rule, posted-only. A motor vehicle or combination with a declared gross weight over 26,000 pounds (vehicles built for 16+ passengers excepted) must drive in the lane or lanes that ADOT or a local authority designates — but only where signs are erected giving notice (A.R.S. 28-736). Also covers a vehicle towing a pole trailer rated 6,000+ pounds. No signs, no lane restriction. Exceptions: preparing to turn, entering or exiting the highway, or when you must use another lane to stay on your route.. See A.R.S. 28-736. You may still use it to pass, turn left, or when directed.

Is there a truck lane restriction in Arizona?

Yes. Enabling rule, posted-only. A motor vehicle or combination with a declared gross weight over 26,000 pounds (vehicles built for 16+ passengers excepted) must drive in the lane or lanes that ADOT or a local authority designates — but only where signs are erected giving notice (A.R.S. 28-736). Also covers a vehicle towing a pole trailer rated 6,000+ pounds. No signs, no lane restriction. Exceptions: preparing to turn, entering or exiting the highway, or when you must use another lane to stay on your route. It applies on Wherever ADOT or a local authority has run a traffic study and posted lane-designation signs. No statewide blanket left-lane ban..

What is the fine for a lane violation in Arizona?

Civil traffic violation. Base fine plus mandatory state surcharges; totals run to roughly $250-$375 depending on the court that writes the ticket.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.azleg.gov/ars/28/00736.htm. See our Terms & Disclaimer.

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Arizona Truck Lane Restrictions

Which lanes a truck can use in Arizona

Roads, exceptions, and signs

What a lane violation costs

Arizona Truck Lane FAQ

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