If it's terminal one , you walk. If it's the rest of the terminals take the shuttle who drop you off right in front of the rental car, after take the elevator on the second floor and here you are ....
The terminals at the airport are in the typical "U" shape with a large parking structure in thr center. The entire 1st parking structure is several floors of rental agencies. The signs are very easy to follow when you get off the plane. I believe there are 7 terminals in FLL and the rental cars are in the parking structure flanked by terminals 1 and 7 on either side. Enjoy your visit.
Take the bus....outside and look right
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