On the map, it looks like a thread stretched between the mainland and an archipelago. On the road, that's exactly what it is: a single ribbon of asphalt, with no way out, that commits you for good.
A Road, Not a Network
The Overseas Highway, officially US-1, links Florida City to Key West over roughly 200 km (125 miles). It follows the old route of Flagler's railway, destroyed by a hurricane in 1935 — a legacy still felt in the way the road jumps from island to island rather than simply tracing a coastline.
Between the two ends, more than forty bridges span the channels and inlets. The longest, the Seven Mile Bridge, stretches its straight line for about 11 km over turquoise water, without a single intersection.
That detail changes everything: there is no parallel road. No bypass ramp, no side route to skip a bridge or catch a missed turn. Once you're on the roadway, you keep going to the next inhabited island, and that's it. Among the road trips covered by the Carnet, this is a configuration found nowhere else: a dead-end island geometry, where the road itself is the only infrastructure.
For a rental campervan or motorhome, this constraint doesn't show up on a tourist map. It gets negotiated well before departure, in how you plan your stops and choose your vehicle.
Why You Don't Turn Around on a Bridge
Most bridges on the Overseas Highway come down to two lanes with no hard shoulder, or one so narrow it barely counts. In peak season, traffic thickens, and a simple slowdown is enough to turn the crossing into a solid line of bumper-to-bumper vehicles above the water.
In that setup, a forced stop is never a minor thing. A breakdown, a jam that won't clear, a gust of wind that forces you to slow down: for a rental campervan or motorhome, stopping on a span means blocking everyone behind you. There's nowhere to pull over, no one can pass without crossing the solid lines, and no one behind you can turn back to find another way — there isn't one.
That's also why you never reverse course mid-bridge. U-turns are only possible at the rare junction points between islands, where the road touches dry land again. A forgotten stop, a change of plan, second thoughts: all of that gets settled before you commit, not during.
Wind adds its own difficulty. On long spans like the Seven Mile Bridge, exposed with no obstacles on either side, crosswind gusts hit noticeably harder than elsewhere — and a tall vehicle, as a motorhome often is, feels it more than most. This isn't a minor detail: it's a question of holding your line for several kilometres with no option to stop.
Choosing Your Stops: Key Largo, Islamorada, Marathon
The road imposes its own structure, and it's worth knowing it before you leave rather than discovering it with an empty tank halfway across a bridge. Three towns shape the route between Florida City and Key West: Key Largo to the north, gateway to the Keys, then Islamorada a little further on, then Marathon, sitting just before the Seven Mile Bridge.
These aren't just names on a map. They're where fuel stations, water points, and dump stations cluster — everything a motorhome needs to keep going without worry. Between these three stops, services thin out, sometimes over long stretches where you'll find nothing but a two-lane road and ocean on either side.
The logic is simple to state, less instinctive to follow: you stop before committing to a long stretch of bridges, not during, and certainly not on the assumption that you'll find something on the other side. The Seven Mile Bridge in particular leaves no margin — you should approach it with a full tank and levels checked.
Pull-offs to catch your breath along the way do exist, but they stay rare and basic: simple widenings of the roadway, with no water or power, good for parking a few minutes, not for a proper break.
The Nomad tip
Fill up and empty your wastewater every time you pass through Key Largo, Islamorada, or Marathon, even if your levels still look fine. Between these three points, some stretches offer no station for dozens of kilometres: better to set off half-full three times than to cut it close once.
Which Vehicle to Take on This Road
On this road, size isn't a comfort detail: it's what determines how you handle the bridges and how you find a spot at the rare stopping points. A campervan, narrower and more manoeuvrable, slips through the tight lanes of the bridge spans without trouble and fits more easily into the roadway widenings that serve as pull-offs. A larger motorhome takes more of a beating from the wind on long spans like the Seven Mile Bridge — as noted, this isn't just about comfort, it's about holding a line for several kilometres with no option to stop.
Lanes on the Overseas Highway are among the narrowest you'll find on any campervan road trip, typically around 3.30 m wide, leaving little margin for a wide vehicle passing a truck or bus in the middle of a bridge.
As for Class A-style motorhomes, sometimes as long and tall as buses, they aren't banned from this road, but they lose all flexibility on it: fewer places to stop and more exposure to wind, especially in the dense traffic lines of peak season.
For this particular route, the campervan remains the most comfortable choice. A larger motorhome holds up well too, provided you accept driving a touch more cautiously on the exposed bridges.
Which vehicle for this trip?
For a road like the Overseas Highway, a CoolDrive Nomad campervan offers the manoeuvrability that actually matters: narrow bridge lanes, rare stopping slots, and wind that can pick up fast. Enough to take on Key Largo, Islamorada, and Marathon without ever feeling boxed in.
From 67 €/day
The Right Time to Set Off
Leaving early in the morning isn't just a habit for road trippers in a hurry: on this road, it's a tactical decision. Traffic builds up later in the day, and the wind tends to strengthen as the afternoon wears on. An early start means both a clearer roadway and steadier conditions for tackling the long exposed spans.
There's a more serious reason to watch the sky before setting off. US-1 isn't only the road you take to visit the Keys: it's also, first and foremost, the evacuation route for the entire archipelago in the event of a hurricane. If a tropical system is forecast, authorities can restrict traffic or reverse it entirely to move residents toward the mainland. In that scenario, there's no parallel road to work around the area, no fallback route: you follow the instructions, or you don't drive.
That doesn't mean avoiding the Keys during hurricane season — plenty of Nomads pass through without issue at that time of year. But it does mean you don't set off on this road blind: a quick check of local weather advisories before getting behind the wheel tells you whether the day looks normal or whether it's worth waiting one more day in Florida City.
The Nomad tip
Before leaving Florida City, check local weather advisories, not just a generic weather app. Keys-specific bulletins announce traffic restrictions well before they become visible on the road itself.
Frequently Asked Questions
Can you turn around on the Keys road in a campervan?
No, not on a bridge. The spans of the Overseas Highway leave no room to manoeuvre, and a U-turn is only possible at the junction points between islands, where the road touches dry land again. Any hesitation about the route needs to be settled before committing to a bridge, never during.
How long does it take to drive from Florida City to Key West in a campervan?
At campervan pace, plan on a full day of driving, with regular stops in the stopover towns rather than doing it in one go. It's not the distance that's the issue, but the road's own configuration, which invites frequent stops and no rushing on the long spans.
Are there rest areas on the Overseas Highway?
Very few, and they're mostly limited to simple widenings of the roadway, with no water or power. The real service points — stations, water, dump stations — cluster in the stopover towns the road passes through, not between them.
What do you do if a hurricane threatens while you're on the road?
Follow official instructions, without exception. US-1 is the only evacuation route for the entire archipelago, and authorities can restrict or reverse traffic in case of an alert. Never set off on the road if an evacuation is underway: there's no fallback route once you're on the bridges.
