HEADWAY - definição. O que é HEADWAY. Significado, conceito
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O que (quem) é HEADWAY - definição

DISTANCE OR DURATION BETWEEN VEHICLES IN TRANSPORT OPERATION
  • An example of headway on a railway system with multiple block section. Train B can only enter a section with a green or yellow "aspect" (light), and must reduce speed when passing a yellow signal to the point where they can stop within the sighting distance.

headway         
n. to gain, make headway against
Headway         
·noun The progress made by a ship in motion; hence, progress or success of any kind.
II. Headway ·noun Clear space under an arch, girder, and the like, sufficient to allow of easy passing underneath.
headway         
If you make headway, you progress towards achieving something.
There was concern in the city that police were making little headway in the investigation.
= progress
PHRASE: oft with brd-neg, V inflects

Wikipédia

Headway

Headway is the distance or duration between vehicles in a transit system measured in space or time. The minimum headway is the shortest such distance or time achievable by a system without a reduction in the speed of vehicles. The precise definition varies depending on the application, but it is most commonly measured as the distance from the tip (front end) of one vehicle to the tip of the next one behind it. It can be expressed as the distance between vehicles, or as time it will take for the trailing vehicle to cover that distance. A "shorter" headway signifies closer spacing between the vehicles. Airplanes operate with headways measured in hours or days, freight trains and commuter rail systems might have headways measured in parts of an hour, metro and light rail systems operate with headways on the order of 90 seconds to 20 minutes, and vehicles on a freeway can have as little as 2 seconds headway between them.

Headway is a key input in calculating the overall route capacity of any transit system. A system that requires large headways has more empty space than passenger capacity, which lowers the total number of passengers or cargo quantity being transported for a given length of line (railroad or highway, for instance). In this case, the capacity has to be improved through the use of larger vehicles. On the other end of the scale, a system with short headways, like cars on a freeway, can offer relatively large capacities even though the vehicles carry few passengers.

The term is most often applied to rail transport and bus transport, where low headways are often needed to move large numbers of people in mass transit railways and bus rapid transit systems. A lower headway requires more infrastructure, making lower headways expensive to achieve. Modern large cities require passenger rail systems with tremendous capacity, and low headways allow passenger demand to be met in all but the busiest cities. Newer signalling systems and moving block controls have significantly reduced headways in modern systems compared to the same lines only a few years ago. In principle, automated personal rapid transit systems and automobile platoons could reduce headways to as little as fractions of a second.

Exemplos do corpo de texto para HEADWAY
1. Military efforts are meanwhile making headway, Ostlund says.
2. "We examined many men but could not make much headway.
3. But few expect major headway or concessions from Bush.
4. "We‘re making good headway," fire information officer Brian Morris said.
5. There is a headway, but the resolution takes time.