Motion Sickness: Miami to Key West Drive
The Miami to Key West trip covers about 165 miles (265 km) and takes around 3.5 hours. The terrain is overseas highway, which makes it a moderate motion sickness risk route.
The drive from Miami runs down US-1 onto the Overseas Highway, whose 113 miles from Key Largo to Key West cross 42 bridges, including the famous Seven Mile Bridge. While the road is straight, the constant rise and fall between bridges and the visual disorientation of driving over open water can trigger motion sickness in sensitive passengers.
Key facts
- The Miami to Key West trip covers about 165 miles, which is 265 km.
- It takes about 3.5 hours.
- The terrain is overseas highway, which puts the route in the moderate band for motion sickness.
- 3 sections are flagged as motion sickness pressure points, starting with Seven Mile Bridge.
- Steadiest place to sit: Front passenger seat with eyes on the horizon.
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Where Motion Sickness Hits Hardest
The sections most likely to trigger motion sickness are: Seven Mile Bridge, Bahia Honda Bridge, Long Key Bridge. Crossing long bridges in high wind can amplify motion sickness. Check the forecast before you go; on a windy day, plan more breaks on the islands between the long spans.
Measured bends
We counted every bend on this route from OpenStreetMap data: 255.7 km, ranked 23 of 26 road trips for bends per km.
- Bends
- 8
- Bends per km
- 0.03
- Hairpins
- 1
- Busiest 10 km
- 4 bends
Route facts, checked at the source
Each fact below was checked against the linked official or operator page.
- Overseas Highway length: 113 miles of roadway from Key Largo to Key West. visitfloridakeys.com
- Bridges: 42 bridges leapfrogging from key to key. visitfloridakeys.com
- Longest famous span: The Seven Mile Bridge at Marathon, replaced with a wider span in 1982. visitfloridakeys.com
- Scenic designation: Named the first All-American Road of the United States and Florida in 2009. visitfloridakeys.com
- Mile markers: Green mile marker signs on the shoulder or median mark progress. visitfloridakeys.com
Best Seat for Motion Sickness on This Drive
Front passenger seat with eyes on the horizon.
Use a proper rest stop for setup
Keep your kit packed while the car is moving. At a proper stop, prepare your phone and ordinary headphones if you want to try Dizzout as a passenger.
Before you need it: find out how prone you are
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Prevention Tips for the Miami to Key West Drive
- Have Dizzout downloaded before you start, so it is ready the moment symptoms begin
- If you plan to take an over-the-counter tablet such as Bonine or Dramamine, those need 30 to 60 minutes before departure to do anything. Ask a pharmacist first
- Eat lightly before the drive; a heavy meal makes symptoms worse for most people
- Take breaks every 90 minutes minimum on long stretches
- Keep the car cool and well-ventilated
- Avoid reading or phone use in the back seat
Which of those actually hold up when they are tested is a separate question, and we keep the answers in one place: the remedy verdicts, ranked by evidence.
Frequently asked questions
How many bridges are between Miami and Key West?
42 on the Overseas Highway itself, which runs 113 miles from Key Largo to Key West, per the Florida Keys' official visitor site. The Miami to Key Largo leg at the start is ordinary mainland highway, so all the over water driving is concentrated in the second half of the trip.
What is the longest bridge on the way to Key West?
The Seven Mile Bridge at Marathon, the best known span on the route; the current wider bridge replaced the original in 1982. It is long enough that sensitive passengers should set up before it starts: eyes on the horizon, vents on, no phones.
Why can driving over water feel disorienting?
Open water on both sides removes the fixed roadside references your eyes normally use, while the car keeps rising and falling over the bridge spans. Watching the horizon line where sky meets sea gives your inner ear a stable anchor again, and it is the single most useful habit on this drive.
How do mile markers work on the Overseas Highway?
Green mile marker signs on the shoulder or median track your progress down the Keys. They make pacing easy: pick a marker a few miles ahead and promise the queasy passenger a stop there.
Is the Overseas Highway a scenic byway?
Yes. It was named the first All-American Road of the United States and Florida in 2009. Expect sightseeing traffic in season, and plan island stops rather than counting on making time.
What's the fastest way to stop car sickness mid-drive?
Once symptoms have started, pills won't work fast enough - they take 30+ minutes to kick in. The fastest options mid-drive are sound therapy via headphones (Dizzout states relief in about 90 seconds), pulling over for fresh air, and looking at the distant horizon.
Other drives we have looked at
Route facts last checked September 2026. Roads, rules and seasons change; the linked official pages are the live word.