Transportation Law includes regulations for operators, vehicles and infrastructure; as well as the contract of carriage, regulations and relation between the carrier and passenger in public transport, shipper and cargo owners. Attorneys who practice transportation law represent individuals and businesses in cases involving most aspects of travel and commerce on the ground, in the air, and on the water -- including regulation of private and commercial vehicles, aircraft, and vessels; compliance with transportation safety standards; and oversight of commercial freight shipment activity.
Roll is an unincorporated community in central Yuma County, Arizona, United States. It is part of the Yuma Metropolitan Statistical Area. Named for early settler John H. Roll, it lies along the lower Gila River, between the Yuma Proving Ground and the Barry M. Goldwater Air Force Range. Local roads connect Roll to Interstate 8, east of the city of Yuma, the county seat of Yuma County. Its elevation is 262 feet (80 m), and it is located at 32°45′6″N 113°59′21″W / 32.75167°N 113.98917°W / 32.75167; -113.98917Coordinates: 32°45′6″N 113°59′21″W / 32.75167°N 113.98917°W / 32.75167; -113.98917 (32.7517127, -113.9890993). Although Roll is unincorporated, it has a post office, with the ZIP code of 85347.