This is all in Sheriff Arpaio’s jurisdiction apparently…
And, it seems many of the demonstrators have secured themselves to the vehicles so they can’t be simply towed out of the way.

Protesters lock to car doors by the neck at street shutdown to Trump Rally. Shea blvd and Eagle Mountain #stoptrump pic.twitter.com/5hyRNHhDyd

— Puente Arizona (@PuenteAZ) March 19, 2016