Portland's core sits on a hilly peninsula jutting into Casco Bay, with Munjoy Hill at one end, the Western Promenade at the other and the Old Port along the waterfront in between. I-295 wraps around the peninsula past Back Cove and carries most of the through traffic, while the Maine Turnpike runs along the city's western edge toward Biddeford and Augusta. Forest Avenue carries US 302 northwest toward Westbrook and Windham, US 1 heads north over the Martin's Point Bridge into Falmouth, and the Casco Bay Bridge links the waterfront with South Portland.
On the peninsula, Franklin Street and Congress Street are the main arteries, and Commercial Street runs along the working waterfront beside the wharves. The streets are old, narrow and steep in places, with plenty of one-way blocks and very few driveways, so most cars live at the curb or in a garage. Off the peninsula, Deering, North Deering and the Riverton area have regular driveways and quieter streets. When a big storm hits, the city declares parking bans and tows cars from the snow routes, which turns a dead battery into a much bigger problem.
Portland International Jetport sits on the western edge of the city near the Maine Mall area. METRO buses run across Portland and into neighboring towns, the Downeaster train connects with Boston, and island ferries leave from the waterfront. Plenty of people on the peninsula walk to work, so a car may sit for days between drives, which is hard on batteries in a Maine winter.