Portugal has one of the highest traffic accident rates in Europe, with an estimated ratio of 21 deaths per 100,000 residents annually, as compared to 5.9 deaths per 100,000 residents in the UK.

Portugal's road and highway system is ranked lower than that of many western European countries. The majority of highways consist of two lanes, and there can be long delays because of heavy commercial truck traffic. Toll roads are very expensive, and thus rarely utilized by local drivers, adding to the congestion on secondary roadways.

Poorly lit roads and construction zones, occasional straying livestock and slow-moving agricultural equipment all contribute to the hazards of driving in Portugal. Fines for traffic violations are substantial and usually must be paid on the spot.

Lisbon, in particular, is not for the faint-hearted driver. It may be preferable to utilize public transportation when visiting the city. There are many tram and bus lines that provide an inexpensive and convenient alternative to driving. In addition, taxi service is readily available in all districts.