Arizona Department of Transportation issued the following announcement on May 29.

The Arizona Department of Transportation has extended through the end of June the temporary higher weight limits for commercial trucks hauling critical supplies and goods during the current public health situation.

In response to a national emergency declaration, and to align with the temporary increase in truck weights by neighboring states, ADOT in early April raised the gross weight limit for commercial vehicles to 90,000 pounds without the need for an overweight permit, up from the normal 80,000 pounds. That temporary measure, previously extended to May 31, will remain in effect until June 30.

The temporary weight limits apply to commercial vehicles that are providing direct assistance to COVID-19 relief efforts as outlined in a federal emergency declaration issued in March. This includes, among other essential items, medical supplies related to the diagnosis and treatment of COVID-19, supplies necessary for community safety and preventing the spread of COVID-19, and food and household items for emergency restocking of stores.

Original source can be found here.