Speed limits are typically 25–35 mph in towns, 45–55 mph on main roads, and up to 65 mph on highways, although enforcement varies. Police patrols are present across the island, particularly near toll roads and intersections, so keep your driver’s license, passport (if applicable), and rental agreement with you at all times.
Fuel is priced in U.S. dollars but sold by the liter, not the gallon. Gas stations are common, especially along highways and in towns, and most are self-service. Payment by card is widespread, though carrying some cash is useful for rural stations, tolls, or tipping.
Toll roads are used frequently, especially routes connecting San Juan with the southern and western coasts. These are operated using AutoExpreso, Puerto Rico’s electronic toll system. Most rental companies include a prepaid AutoExpreso tag and charge tolls to your credit card after the rental. Confirm this at pick-up so you're not surprised later.
Finally, night driving is safe in most urban areas but should be done with care on rural roads. Poor lighting, wet surfaces, and unexpected obstacles like animals or fallen branches can appear suddenly. It’s best to complete long drives during the day, especially in unfamiliar terrain.
All in all, Puerto Rico offers one of the most road trip-friendly environments in the Caribbean — and with a rental car, you gain access to coastal towns, forest trails, hidden eateries, and incredible sunset spots across the island.
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