Costa Rica on a US Licence — 0.05 Limit (Stricter Than Home) & Rough Roads

For an American, Costa Rica is one of the friendlier countries to rent a car in — you drive on the right, the signs use the same logic, and no permit paperwork stands in the way. Two things still need flagging before you pull away: the alcohol limit is tighter than home, and the roads are a different animal.

Take the alcohol point, because it surprises people. Most US states set 0.08; Costa Rica draws the line at 0.05, roughly a drink less of margin. Police run sobriety checks on the main routes, and penalties for drink-driving are heavy, so the safe approach is none before driving — the same conclusion most arrive at anyway, just with a smaller buffer than they expect.

Then the roads. The Ruta 1 and the San José corridor feel like home, but step off them and Costa Rica becomes narrow mountain road, potholed, with single-lane bridges where a ceda el paso sign decides who yields. The green season from May to November softens unpaved beach approaches and raises rivers, which is why a 4x4 is the sensible rental for anything beyond the cities. Town limits are a low 40 km/h, with rural roads at 60 and motorways at 100.

Documents are the easy part. Your US licence needs no IDP for a tourist visit; carry it with your passport. The Driving Permit Checker confirms the detail. Speed enforcement uses fixed cameras and roadside checks; a serious overspeed of around 20 km/h over runs to roughly CRC 53,000 (about EUR 95), which the Speeding Fine Calculator can estimate.

Fuel is about $1.28/litre — notably pricier than home — and 911 covers all emergencies, the same number you already dial. Save offline maps for the hills and coast, where signal drops, and read the full rundown in our Costa Rica driving guide.