Paris has one of the largest public transportation systems in the world. It has more than 15 subway lines, 300 Métro stops, 58 bus lines and five modern RER (regional express subway lines).
The Paris Métro was opened in 1900 and is made up of 15 lines on 201.4km of track. Four of the lines are operated with rubber tired trains. There are 370 stations. The system has a flat fare structure with automatic machines that have change giving facilities. There are roving inspectors.
The system has more than one billion passenger journeys yearly with a rolling stock of 3,439 cars. Trains run every 1 min 35 sec to 3 min 50 sec.
One of the RER lines runs near Charles de Gaulle Airport with a convenient shuttle bus to the air terminal.