A 1 or 2 digit number which represents the heading of the runway (for example, a runway pointing due west... 270 degrees... would be "27"). If there are parallel runways, such as at Lambert Field St. Louis, then the right one would be 27R and the left one would be 27L. Since each runway has two ends, the opposite end of runway 27 would be runway 9 (due east, 90 degrees). It's the same pavement, but it's referred to as a separate runway to minimize confusion (It's easier to say "runway 9" than "runway 27, but approach from the west").
No. Runways are designated with numbers that are based on the magnetic heading of the runway. Runway 36 is on a magnetic bearing of 360 or magnetic north. Runway 18 is on a magnetic bearing of 180 or magnetic south. A runway may carry a letter such as 19L and 19R where there are two parallel runways, a Left and a Right with the same heading. Taxiways are normally designated by a single letter, but if an airport has more than 26 taxiways, they can be designated by two letters or a letter followed by a number.
Multiple parallel runways are typically designated using a combination of letters and numbers to differentiate between them. In your example, "A1," "A2," and "A3" indicate three parallel runways on the same alignment, while the letters "l," "c," and "r" signify their respective positions: left, center, and right. This system helps pilots and air traffic controllers clearly identify and communicate about the specific runways in use.
visual runways, non-precision instrument runways, and precision instrument runways
There are no paved runways in Antarctica. Airplanes land on skis, not wheels, on runways of ice.
Vietnam has four runways
Technically yes however Runways have at all times numbers and when more than one runway in the same direction its will have R(right ) L (left) C (centre) i..e R21R is Runway (heading 210 degrees) Right Taxiways have letter and numbers allocated i.e Taxi via Bravo, Bravo 3, Charlie , Delta and Delta 9 for stand 127
there are 5 runways.
Honolulu International Airport has six runways.
Because they are
There are 5 runways at Toronto Pearson International.
Manchester Airport (MAN/EGCC) in the UK has 2 runways: 05L/23R - this is the original runway 05R/23L - this runway is the airport's 2nd runway and was opened in 2001 Runway numbers correspond to their magnetic headings to the nearest 10 degrees (so runway 23 faces approximately 230 degrees magnetic). Due to the nature of constantly changing magnetic variation runways occasionally require re-designating. As a result of this on 07/06/2007 Manchester re-designated their runways from 06L/24R and 06R/24L to 05L/23R and 05R/23L.
because there are plenty of poor nations in africa, and paved runways costs money. On top of the the climate and soil conditions are favourable for keeping unpaved runways operational.