Baton Rouge sits on the east bank of the Mississippi River, and I-10 crosses the river on a tall, narrow bridge into Port Allen. Just east of downtown, I-12 splits off toward Hammond and Slidell, and I-110 runs north toward the airport, Scotlandville and the riverside industrial corridor. Airline Highway, part of US 61, curves across the city as a major surface route, and Florida Boulevard carries US 190 east toward Denham Springs and Walker. On the west bank, LA 1 runs through Port Allen and the river towns, and the older US 190 bridge north of downtown offers a second way across the Mississippi.
The I-10 and I-12 split and the Mississippi River bridge are notorious bottlenecks, and both back up for miles at rush hour and whenever there's a wreck. Siegen Lane, Essen Lane, Bluebonnet Boulevard and Perkins Road are busy commercial corridors on the south side, and College Drive and Government Street carry heavy crosstown traffic. Much of the city has flat, low ground with drainage canals, so heavy rain can fill streets quickly. Older neighborhoods near downtown have narrow lots, while the suburbs have driveways and attached garages.
Baton Rouge Metropolitan Airport sits north of the city off I-110. CATS runs buses across the parish, but most people drive, many commuting to the plants along the river, the state offices downtown or LSU. Plant shift workers often leave cars in large lots for long stretches, and a car that won't start at the end of a shift is a common request. Home football weekends at LSU bring huge crowds to the south side, and Nicholson Drive and Highland Road back up for hours.