Bicycle - Motor Vehicle Collisions on Controlled Access Highways in Arizona [PDF]: Although hundreds of miles of controlled access highways (freeways) are open to bicycle travel in Arizona, bicycle-motor vehicle crashes on the controlled access highways comprised only 0.035% of the total reported bicycle-motor vehicle crashes in Arizona during the evaluation period. The rate of bicycle-motor vehicle crashes on controlled access highways is less than one per year across the entire state of Arizona for over a decade, clearly implying that there is not a large-scale safety problem associated with the use of these highways by bicyclists.