The Paris Métro ( ; short for Métropolitain ) is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the city limits, uniform architecture and unique entrances influenced by Art Nouveau. It is mostly underground and long. It has 304 stations, of which 64 have transfers between lines. There are 16 lines (with an additional four under construction), numbered 1 to 14, with two lines, 3bis and 7bis, named because they started out as branches of Line 3 and Line 7 respectively. Line 1 and Line 14 are automated, with Line 4 scheduled to be in fall 2022. Lines are identified on maps by number and colour, with the direction of travel indicated by the terminus.