Yes
The Seven Mile Bridge is the US1 route between Marathon (Vaca Key) and Knights Key, spanning Moser Channel. It is a two-lane highway span with very narrow shoulders, 55 mph speed limit its full length, and open to passing in both directions for most of it. Just be patient & keep your wits about you, and it'll be a grand little driving adventure. They don't call it the Overseas Hwy for nothing!
Yes of course it is the only way into key west!
Thanks! Your answer is awaiting moderation.