I have commuted in/out of the Port Authority Bus Terminal in NYC for over 26 years. It is regarded as the busiest bus terminal in the world, and one of the biggest in size. It was originally built in 1950, and expanded considerably to the north to it's current structure in the early 1980's. Busses can, by ramps, from the nearby Lincoln Tunnel and several street points, use 2 above ground (almost all for suburban bus services) and 1 lower level floors (mostly long distance/some commuter busses), and there is 1 level of car parking on the top level. Parts, mainly for long distance and selected suburban bus services, operate 24 hours a day, 7 days a week. 85% of the busses are for services to suburban northern New Jersey, mostly by NJ
Transit, one of the biggest public bus services in the USA. The terminal has direct access to the NYC subway system, and NYC bus services are on adjacent streets. The terminal building also has ticket offices and related facilities for NYC tour busses.
As to the special lanes you ask about: I-495, which feeds into the Lincoln Tunnel for about 2 miles, operates on business weekdays, from about 5 am to 10 am, an inbound NYC lane, the 'Exclusive Bus Lane'/XBL, for suburban and other transit busses inbound to the PA Bus Terminal, and elsewhere in NYC, in the what is the 'fast lane' of the outbound I-495. It has special lights above the lane, and every day it is used, special cones are installed and removed in holes in the pavement to indicate the special opposite direction lane. Busses using the lane are required to use specified toll booth lanes, and almost all have to use 'E-Z Pass', an electronic toll paying system.
A typical USA intercity/suburban or long distance coach can seat about 47-54 passangers. There are some articulated busses used into the PABT which can hold over 70 seated passangers. Almost all busses in the USA are equipped with wheelchair lift systems and special doors as due to federal and state subsidies for publc systems and requirements under law otherwise. Almost all long distance ('Greyhound') and many suburban busses are made by a company called MCI
, (Motor Coach Industries) in North Dakota and Canada, with that company in turn owned by a Mexican company called Dana, which makes European style long distance coaches, for charter coach companies. A number of private coach/charter/tour busses are made by either Prevost, a Quebec, Canada company or several European companies, like Setra, Vanttool, and others.