A fleet of 40,000 black-and-yellow taxis ply the streets at all hours. License controls are not enforced rigorously. There have been reports of organized crime controlling the access of taxis to the city airports and other major destinations. Taxi drivers are known for trying to take advantage of tourists. Radio-link companies provide reliable and safe service; many such companies provide incentives for frequent users. Low-fare limo services, known as ''remises'', have become popular in recent years.