Martin Rogers's An introduction to highway engineering PDF

By Martin Rogers

ISBN-10: 0632059931

ISBN-13: 9780632059935

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Sample text

If they are, the procedure is not required. 12) (5) Check whether the destination growth factors are within approximately 5% of unity. If they are, the procedure is not required. 13) Proceed back to point 2. Repeat the process until both the origin or destination growth factors being calculated are sufficiently close to unity (within 5% is usually permissible). 6 gives the matrix of present flows to and from four zones within a transportation study area. It also provides the total number of trips predicted to start from zone i, and the total number of trips predicted to terminate in zone j.

Within it, existing data is analysed in order to obtain a relationship between trip volumes and the generation and attraction of trips along with impedance factors such as the cost of travel. The name is derived from its similarity to the law of gravitation put forward by Newton where trip interchange between zones is directly proportional to the attractiveness of the zones to trips, and inversely proportional to some function of the spatial separation of the zones. 3) j or Tij = j where Tij = trips from zone i to zone j Aj = trip attractions in zone j Pi = trip productions in zone i Fij = impedance of travel from zone i to zone j The impedance term, also called the deterrence function, refers to the resistance associated with the travel between zone i and zone j and is generally taken as a 24 Highway Engineering function of the cost of travel, travel time or travel distance between the two zones in question.

If they are, the procedure is not required. 12) (5) Check whether the destination growth factors are within approximately 5% of unity. If they are, the procedure is not required. 13) Proceed back to point 2. Repeat the process until both the origin or destination growth factors being calculated are sufficiently close to unity (within 5% is usually permissible). 6 gives the matrix of present flows to and from four zones within a transportation study area. It also provides the total number of trips predicted to start from zone i, and the total number of trips predicted to terminate in zone j.

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An introduction to highway engineering by Martin Rogers


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