driving on highways; lane regulations

HB 2087 amends Arizona law to require certain heavy vehicles to use designated highway lanes when signs are posted. It applies specifically to trucks over 26,000 pounds (excluding passenger vehicles) and pole trailers weighing 6,000+ pounds. The bill mandates these vehicles must drive in designated lanes for safer traffic flow, and prohibits them from using the extreme left lane on divided highways with three or more lanes unless lanes are designated. These requirements only apply when official signs are present, and do not affect regular passenger vehicles.