What is the maximum weight of a vehicle on the highway?

In Arizona, and most other states: It is 20,000 lbs per axle.

28-1099. Single axle load limit; exception

A. The gross weight imposed on the highway by the wheels of any one axle of a vehicle shall not exceed twenty thousand pounds, except that the director may issue a special permit pursuant to section 28-1103 for the purpose of moving road machinery that exceeds the maximum weight specified in this section from job to job within this state and from job to place of servicing and return within this state.

B. This section shall not be construed to limit in any manner the power of the director and a local authority to issue a special permit pursuant to section 28-1103.

C. For the purposes of this article, the gross weight imposed on the highway by the wheels of any one axle equals the total load transmitted to the road by all wheels whose centers are included between two parallel transverse vertical planes forty inches apart, extending across the full width of the vehicle.

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