Vehicles drive on the right in Portugal. Unless otherwise indicated, vehicles coming from the right have priority in squares and at intersections. At junctions with roundabouts, vehicles already on the roundabout have right of way.
Road signs comply with international rules.

Compulsory papers:
- Personal ID
- Driving licence
- Motor insurance certificate
- Vehicle registration or equivalent
- Vehicle logbook (livrete)or equivalent

On the spot fines are issued.

Speed limits for cars without trailers and motorcycles:
  50 kph - in built-up areas
  90 kph - on normal roads
100 kph - on roads restricted to motor vehicles
120 kph - on motorways

It is illegal to drive with a blood alcohol level of 0.5 grams per litre or more.

All occupants must wear seat belts.

The Portuguese Highway Code forbids the use of mobile phones while driving, unless you’re using hands-free equipment or an earphone.