Abstract
Distance is one of the important factors in determining transportation cost and travel time, and it can be easily estimated by measuring the circuity of road networks. This study calculated the circuity factors to estimate the network distance for 27 forest roads (about 105 km) in South Korea. For this purpose, ridge, mid-slope, and valley roads were classified according to the construction location of the mountain slope, and the weighted and unweighted circuity factor (each 500-m section) were calculated. The average value of weighted circuity was 1.55: mid-slope roads (2.09), ridge roads (1.36), and valley roads (1.09). The average unweighted circuity factors were 1.61 for mid-slope roads, 1.21 for ridge roads, and 1.07 for valley roads. This study found that the circuity of the forest road network was most affected by the mountain terrain. In addition, the circuity factor increased with increasing network distance in the mid-slope roads but was not affected by the network distance in ridges and valleys. To improve the efficiency of transportation in the forest road network, it is important to locate the ladings and properly connect with the public road network.
Highlights
Distance is the numerical value by which two objects are physically separated, and travel distance is an important factor in determining the accessibility to any destination in the transport and logistics sector [1]
The ridge roads are the route section where the vertical height of the slope is over 70%; the mid-slope roads are the section where the vertical height of the slope is between 41% and 70%; the valley roads are defined as a section along a valley with a slope of less than 40% [21]
Circuity Factors Vary with Cumulative Network Distance at the Vertical Position of Forest Roads
Summary
Distance is the numerical value by which two objects are physically separated, and travel distance (i.e., network distance) is an important factor in determining the accessibility to any destination in the transport and logistics sector [1]. Most studies of distance analysis used a distance estimating function based on the Euclidean distances of two points [1,3,5,6,7]. The circuity factor of a road network, which is one of these distance estimating functions, is defined as the ratio of the shortest distance to the network distance in the road network for two different points [4,8]. The circuity factor for a target area can be calculated accurately after the road is constructed, so that the actual distance of the route to be planned can be estimated using the circuity factor for similar terrain or nearby areas [11]
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