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Optimum turnout spacing on forest haul roads

University of British Columbia

Mathematical models are developed to determine the optimum spacing of turnouts and to predict the time lost due to the acceleration and deceleration of the vehicle and the time the vehicle spends in the. turnout. Previous articles have not completely defined a method of deriving or measuring the delay in the turnout attributable to turnout spacing. The concept of the expected F-factor, a measurement of the expected delay in the turnout, is introduced. The expected F-factor is the expected distance the loaded vehicle is from the empty vehicle, once the empty vehicle has come to a complete halt in the turnout, divided by the turnout spacing. . Two forms of the expected F-factor equation were developed. The results shew that the total expected delay time attributable to turnout spacing may be a significant part of the travel empty time (i.e., 20 percent) but its significance is reduced when compared to the round trip time. The optimum turnout spacing model is concerned with minimizing the sum of the turnout construction and maintenance costs and the cost of delays attributable to turnout spacing.. If the results of the optimum turnout spacing model are used in the initial design of the.road network then the total potential savings can be important. Implementation of the optimum turnout spacing model can be achieved with the .utilization of tables. These tables can be utilized as a guide in the design and construction of forest haul roads.

Text

2010-03-13

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http://hdl.handle.net/2429/21862

Forestry

University of British Columbia

Graduate