Carriageway

A carriageway (British English)[1] or roadway (North American English)[2] consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A carriageway generally consists of a number of traffic lanes together with any associated shoulder, but may be a sole lane in width (for example, a highway offramp).

Diagram showing different arrangements of the elements of a road

Description

A single carriageway road (North American English: undivided highway) has one carriageway with 1, 2 or more lanes together with any associated footways (North American English: sidewalk) and road verges (North American English: tree belt). A dual carriageway road (North American English: divided highway) has two roadways separated by a central reservation (North American English: median). A local-express lane system (also called collector-express or collector-distributor) has more than two roadways, typically two sets of 'local lanes' or 'collector lanes' and also two sets of 'express lanes'. "Cars only" lanes may be physically separated from those open to mixed traffic including trucks and buses. The New Jersey Turnpike (I-95) in the United States, uses this design from the Pennsylvania Turnpike to its northern terminus at the George Washington Bridge in Fort Lee. High-occupancy vehicle lanes may also be physically separated from the remainder of the general traffic lanes as a distinct roadway. Some cities such as Pittsburgh, Pennsylvania, have many bus-only roadways to alleviate congestion related to public transit buses, despite its very challenging topography which severely limits the extent to which arterial roadways can be added or augmented.

gollark: Do cloud providers start stuff that much faster than generic VPS ones? All the VPS providers I've used can manage initialisation in a few minutes.
gollark: But it still seems like a big price delta given that, like you said, they have ridiculous economies of scale.
gollark: I have an old tower server which costs maybe £5/month to run, which provides ~4x the CPU/RAM and ~10x the disk I'd get from a cloud provider at similar pricing, plus I could install a spare GPU when I wanted that. This is a very extreme case since I am entirely ignoring my time costs on managing it and don't have as much redundancy as them.(Edit: also terrible internet connectivity, and colocation would be expensive)
gollark: Possibly also that you can hire fewer sysadmins? But I'm not sure they're that expensive if you have a lot of developers anyway.
gollark: I think the argument for cloud is mostly that it's much faster to scale than "have a bunch of servers in your office", but it seems like you pay an insane amount for that.

See also

References
  1. "Multi-lane carriageways (133-143)". Highway Code. A dual carriageway is a road which has a central reservation to separate the carriageways.
  2. "Railroad-Highway Grade Crossing Handbook - Revised Second Edition August 2007 - Glossary". Federal Highway Administration. The portion of a highway, including shoulders, for vehicular use. A divided highway has two or more roadways.
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