Idaho Falls sits on the Snake River where the upper Snake River Plain meets the farm country of eastern Idaho. I-15 runs north and south along the west side of town, connecting to Pocatello and Montana. US 20 heads northeast toward Rexburg, Island Park and Yellowstone, and west across the desert toward Arco and the Idaho National Laboratory. US 26 runs east up the river toward Swan Valley and the Wyoming line. The city is the commercial center for a wide region, so drivers come in from Rexburg, Blackfoot and the farm towns for work, shopping and medical care.
In town, Broadway crosses the river near the falls and the greenbelt, 17th Street and Sunnyside Road carry east-side shopping traffic toward Ammon, and Yellowstone Highway runs north along the older commercial strip. Winter is when driving here becomes serious: ground blizzards on I-15 and US 20 can wipe out visibility, and a car that won't start in a parking lot at the end of a frigid day is a real problem. On ordinary days, though, traffic is light and the layout is simple, so a mechanic can usually reach any neighborhood quickly.
Idaho Falls Regional Airport sits beside the river on the west side of town, and its lots see cars sitting through cold snaps while owners travel. Many people commute to the national laboratory out on the desert, often riding employer buses from pickup points around town, which leaves cars parked all day in the cold. Public transit is limited, so most households depend on reliable vehicles.