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A signal in the Flushing–Main Street station. Most trains on the New York City Subway are manually operated. As of 2022, the system currently uses automatic block signaling, with fixed wayside signals and automatic train stops. Many portions of the signaling system were installed between the 1930s and 1960s.
mta .info /bandt. The Triborough Bridge and Tunnel Authority ( TBTA ), doing business as MTA Bridges and Tunnels, is an affiliate agency of the Metropolitan Transportation Authority that operates seven toll bridges and two tunnels in New York City. The TBTA is the largest bridge and tunnel toll agency in the United States by traffic volume.
1⁄2 in ( 1,435 mm) standard gauge. The Maryland Transit Administration ( MTA) is a state-operated mass transit administration in Maryland, and is part of the Maryland Department of Transportation. The MTA operates a comprehensive transit system throughout the Washington-Baltimore metropolitan area. There are 80 bus lines serving the Baltimore ...
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The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
Pastia's lines. Pastia's sign, Pastia lines, or Thompson's sign is a clinical sign in which pink or red lines formed of confluent petechiae are found in skin creases, particularly the crease in the antecubital fossa, the soft depression on the inside of the arm; the folding crease divides this fossa where the forearm meets the (upper) arm (the ...
The Los Angeles County Metropolitan Transportation Authority operates the third-largest public transportation system in the United States by ridership with a 1,433 mi 2 (3,711 km 2) operating area and 2,000 peak hour buses on the street any given business day. Metro also operates 109 miles (175 km) of urban rail service. [1]