Runway threshold markings come in two configurations. They either consist of eight longitudinal stripes of uniform dimensions disposed symmetrically about the runway centerline, or the number of stripes is related to the runway width as indicated. A threshold marking helps identify the beginning of the runway that is available for landing. In some instances the landing threshold may be relocated or displaced.
Visual runways are used at small airstrips and are usually just a strip of grass, gravel, ice, asphalt, or concrete. Although there are usually no markings on a visual runway, they may have threshold markings, designators, and centerlines. Additionally, in the real world, they do not provide an instrument-based landing procedure; pilots must be able to see the runway to use it.
There are runway markings and signs on most large runways. Larger runways have a distance remaining sign (black box with white numbers). This sign uses a single number to indicate the remaining distance of the runway in thousands of feet. For example, a 7 will indicate 7,000 ft (2,134 m) remaining. The runway threshold is marked by a line of green lights.
It’s important to understand that while under flight following, you do not delegate any of you responsibilities as pilot in command to ATC. You are still responsible for seeing and avoiding other aircraft.
Above is a visual of when and where aircraft can see the airport, to report airport in sight. In this scenario KSAN is using runway 27, so aircraft would be flying eastbound. The white line signifies the path the pilot will be able to see the airport, the grey is a path the pilot would not be able to see the airport.
This is a helpful piece of information to have for approach controllers who are learning when to issue a “report airport in sight” command. If they can’t see the airport, how are they supposed to report airport in sight?