TY - GEN
T1 - Research on dynamic characteristics of road network in snowy conditions
AU - Xiaoqiang, Ren
AU - Longhai, Yang
AU - Xiqiao, Zhang
AU - Dongxu, Fan
PY - 2009
Y1 - 2009
N2 - The operational status of road networks in snowy conditions is quite different from that in general conditions, especially in the process of traffic assignment. Traffic assignment in snowy conditions of different snowfall degrees is studied in this paper, and the impedance function is modified by amending the three following parameters: time, speed and capacity. In snowy conditions, speed is modified by considering the change of road surface friction coefficient. The minimum safe headway is taken into consideration in the modification of capacity, and the modification of time is obtained by simulation. Based on the new impedance function and equilibrium assignment model, the traffic in the road network are assigned in the snowy conditions of different snowfall degrees. An example was also cited to prove that the algorithm is feasible. By comparing the assignment results in the general conditions and snowy conditions of different snowfall degrees in the example, changes of characteristic indexes of road networks like average travel speed and traffic flow in all grade of roads are given. The changing trend of the indexes is also presented. At last, some suggestions are put forward on the value of reserve capacity to enhance the environmental adaptability of road networks in snowy conditions.
AB - The operational status of road networks in snowy conditions is quite different from that in general conditions, especially in the process of traffic assignment. Traffic assignment in snowy conditions of different snowfall degrees is studied in this paper, and the impedance function is modified by amending the three following parameters: time, speed and capacity. In snowy conditions, speed is modified by considering the change of road surface friction coefficient. The minimum safe headway is taken into consideration in the modification of capacity, and the modification of time is obtained by simulation. Based on the new impedance function and equilibrium assignment model, the traffic in the road network are assigned in the snowy conditions of different snowfall degrees. An example was also cited to prove that the algorithm is feasible. By comparing the assignment results in the general conditions and snowy conditions of different snowfall degrees in the example, changes of characteristic indexes of road networks like average travel speed and traffic flow in all grade of roads are given. The changing trend of the indexes is also presented. At last, some suggestions are put forward on the value of reserve capacity to enhance the environmental adaptability of road networks in snowy conditions.
KW - Adaptability of road network
KW - Impedance function
KW - Snowy conditions
KW - Traffic assignment
UR - https://www.scopus.com/pages/publications/71049124031
U2 - 10.1061/41064(358)193
DO - 10.1061/41064(358)193
M3 - 会议稿件
AN - SCOPUS:71049124031
SN - 9780784410646
T3 - Proceedings of the 9th International Conference of Chinese Transportation Professionals, ICCTP 2009: Critical Issues in Transportation System Planning, Development, and Management
SP - 1378
EP - 1384
BT - Proceedings of the 9th International Conference of Chinese Transportation Professionals, ICCTP 2009
PB - ASCE - American Society of Civil Engineers
T2 - 9th International Conference of Chinese Transportation Professionals, ICCTP 2009: Critical Issues in Transportation System Planning, Development, and Management
Y2 - 5 August 2009 through 9 August 2009
ER -