|Table of Contents|

Safety evaluation method of freeway segment based on accident data and safety service level(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2014年06期
Page:
83-91
Research Field:
交通运输规划与管理
Publishing date:

Info

Title:
Safety evaluation method of freeway segment based on accident data and safety service level
Author(s):
MENG Xiang-hai;  LI Xin;  ZHENG Lai
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
Keywords:
traffic safety;  freeway;  safety evaluation;  segment division;  dynamic cluster analysis;  negative binomial distribution;  safety service level
PACS:
U491
DOI:
-
Abstract:
The basic division method of freeway segment was analyzed, the unequal-length division method of dynamic clustering segment based on the concentration and dispersion degrees of accident point was put forward. The accident prediction model was calibrated based on negative binomial distribution, the safety evaluation method of freeway segment based on negative binomial distribution was proposed. The concept of safety service level was introduced, the classification standard was determined, the safety evaluation method of freeway segment based on safety service level was proposed, and the example verification was carried out. Verification result indicates that when the 109 segments of Jingzhu Freeway are evaluated by using the two methods respectively, the 57.8% of segments have the same results, the segment amounts of safety conditions in great, good, normal, poor are 5, 63, 36 and 5 respectively by using the safety evaluation method based on negative binomial distribution, while the segment amounts of safety conditions in great, good, normal, poor are 1, 64, 26 and 18 respectively by using the safety evaluation method bassed on safety service level. The evaluation result of safety evaluation method based on negative binomial distribution is more in line with freeway actual safety situation. The safety evaluation method based on negative binomial distribution considers traffic volume and geometric alignment, and is more suitable for the freeway with complex geometric alignment conditions. The safety evaluation method based on safety service level considers traffic volume and accident frequency, and is more suitable for the freeway with better geometric alignment conditions. 8 tabs, 5 figs, 20 refs.

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Last Update: 2014-12-20