Public transport in Santiago is both efficient and practical for tourists. The Metro de Santiago is an easy and efficient way to get around in Santiago at a reasonable price and the system services most places of interest. MetroBuses serve the Metro stations to act as an extension to the rail system. Competing private companies run Santiago's many minibuses (micros), with their drivers working on a commission basis dependant on collecting as many fares as possible. Buses tend to race each other chaotically through the city's main streets and can be a dangerous option. Quicker and more comfortable are the colectivos, which have fixed routes and can take five passengers. They look like regular taxis, but display their route on the roof. Taxis can be hailed on any street corner, or radio taxis can be called to the door. Taxis are relatively inexpensive, but it is always best to decide on a rate before setting off as not all of the taxis are metered. Although renting a car is possible, driving yourself around in Santiago is not recommended due to heavy congestion and limited parking. Santiago is also a good city for getting around on foot because it is arranged on a simple grid system that makes it easy to negotiate with a map.