Security Design in Tianjin City Expressway Entrances and Exits

2014 ◽  
Vol 587-589 ◽  
pp. 2151-2155
Author(s):  
Juan Zi Zhang
Keyword(s):  
Factor Analysis ◽  
Traffic Safety ◽  
Conflict Theory ◽  
Evaluation Index ◽  
Security Design ◽  
Safety Factors ◽  
Safety Design ◽  
Traffic Conflict ◽  
Tianjin City ◽  
Traffic Behavior

According to traffic safety factor analysis of freeway entrances and exits, this paper use traffic behavior and traffic conflict theory, select the number of conflicts as the evaluation index, use SSAM software to analyze the safety factors in freeway entrance area. On this basis, this paper put forward recommendations about intersection traffic safety design.

Evaluation of Traffic Safety of Curved Section with Gray Theory Based on the Driving Track

2012 ◽  
Vol 588-589 ◽  
pp. 2117-2120
Author(s):  
Jian Feng Xi ◽  
Zhen Hai Gao ◽  
Bo Qi ◽  
Hai Zhu Liu
Keyword(s):  
Traffic Safety ◽  
Traffic Accidents ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
The Other ◽  
Evaluation Index ◽  
Gray Theory ◽  
Traffic Conflict ◽  
Curved Section

Curved section is one of the sections where happened extraordinarily serious traffic accidents in China. Until now, one kind of the traffic safety evaluation method based on the accident indexes, the other based on the non-accident indexes, just as the traffic conflict technique. But there are difficulties in collecting data when the evaluation of traffic safety on specific road sections is applied. So, one safety evaluation method for the curved sections is putting forward, in which the deviation value between the driving track and safe trajectory is used as the evaluation index, and the gray evaluation method is applied. The case study shows that, the method in this paper could be a new way for traffic safety evaluation.

scholarly journals Determining an Improved Traffic Conflict Indicator for Highway Safety Estimation Based on Vehicle Trajectory Data

2021 ◽  
Vol 13 (16) ◽  
pp. 9278
Author(s):  
Ruoxi Jiang ◽  
Shunying Zhu ◽  
Hongguang Chang ◽  
Jingan Wu ◽  
Naikan Ding ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Traffic Safety ◽  
Pearson Correlation ◽  
Highway Safety ◽  
Lane Change ◽  
Trajectory Data ◽  
Average Value ◽  
Traffic Conflict ◽  
Vehicle Trajectory ◽  
Safety Estimation

Currently, several traffic conflict indicators are used as surrogate safety measures. Each indicator has its own advantages, limitations, and suitability. There are only a few studies focusing on fixed object conflicts of highway safety estimation using traffic conflict technique. This study investigated which conflict indicator was more suitable for traffic safety estimation based on conflict-accident Pearson correlation analysis. First, a high-altitude unmanned aerial vehicle was used to collect multiple continuous high-precision videos of the Jinan-Qingdao highway. The vehicle trajectory data outputted from recognition of the videos were used to acquire conflict data following the procedure for each conflict indicator. Then, an improved indicator Ti was proposed based on the advantages and limitations of the conventional indicators. This indicator contained definitions and calculation for three types of traffic conflicts (rear-end, lane change and with fixed object). Then the conflict-accident correlation analysis of TTC (Time to Collision)/PET (Post Encroachment Time)/DRAC (Deceleration Rate to Avoid Crash)/Ti indicators were carried out. The results show that the average value of the correlation coefficient for each indicator with different thresholds are 0.670 for TTC, 0.669 for PET, and 0.710 for DRAC, and 0.771 for Ti, which Ti indicator is obviously higher than the other three conventional indicators. The findings of this study suggest TTC often fails to identify lane change conflicts, PET indicator easily misjudges some rear-end conflict when the speed of the following vehicle is slower than the leading vehicle, and PET is less informative than other indicators. At the same time, these conventional indicators do not consider the vehicle-fixed objects conflicts. The improved Ti can overcome these shortcomings; thus, Ti has the highest correlation. More data are needed to verify and support the study.

Construction of Evaluation Index System for Finnish Design Policy

2014 ◽  
Vol 989-994 ◽  
pp. 5373-5377
Author(s):  
Chao Jie Chen ◽  
Hai Fang ◽  
Dong Jiu Yu
Keyword(s):  
Factor Analysis ◽  
Delphi Method ◽  
Index System ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Analysis Approach ◽  
Policy Environment ◽  
The Index System ◽  
Design Innovation

Finland is the first country that formulates the design policy, and these successful experience and lessons are deserved to be focused and studied. This paper has a research on the Finnish policy index with the factor analysis approach and Delphi Method, and sorts out the opinions of policy planners, building the index system of design policy which is used to evaluate the effectiveness and result of Finnish design policy, and then studies the exterior policy environment where design innovation drives the development of country, and provides important reference for the system summary, the effectiveness, problem and tendency of the Finnish design policy.

H∞ control of anti-rollover strategy based on predictive vertical tire force

2017 ◽  
Vol 40 (13) ◽  
pp. 3587-3603 ◽  
Author(s):  
Wanzhong Zhao ◽  
Lin Ji ◽  
Chunyan Wang
Keyword(s):  
Control System ◽  
Traffic Safety ◽  
Transfer Rate ◽  
Load Transfer ◽  
Strong Stability ◽  
Rear Wheel ◽  
Evaluation Index ◽  
Highway Traffic ◽  
National Highway Traffic Safety ◽  
Tire Force

The mainstream rollover evaluation index, lateral load transfer rate (LTR), is commonly used in the rollover control field. However, it is not instant enough to reflect the rollover tendency since it can only reflect the load transfer rate of one side wheels while single rear wheel leaves the ground first during rollover happens. In order to monitor the rollover tendency more instantly and improve the reliability of anti-rollover control system, a new evaluation index called predictive vertical tire force (PVTF) is proposed, which is based on the single vertical tire force and merges both iterative prediction and derivative prediction methods. Meanwhile, an optimization is taken to solve the contradiction between prediction time and deviation. Secondly, using the PVTF as the measurement output, an anti-rollover control system based on active steering is established in this paper. In order to achieve the desired tracking effect and anti-jamming capability, a two-way H∞ controller is adopted in the anti-rollover control system. Lastly, the simulation results of J-turn condition and NHTSA (national highway traffic safety administration) condition are conducted and the results indicate that the anti-rollover control system has strong stability and robustness. Meanwhile, benefit from the pre-warning function of PVTF, the controller is triggered earlier and the vertical tire forces of four wheels are controlled to be positive all the time, which is beneficial for handling stability.

The Application of Factor Analysis in the Study on Cultural Industry Competitiveness Evaluation Index System

2014 ◽  
Vol 989-994 ◽  
pp. 5132-5135
Author(s):  
Ping Sun
Keyword(s):  
Factor Analysis ◽  
Statistical Analysis ◽  
Index System ◽  
Evaluation Model ◽  
Evaluation Index System ◽  
Final Evaluation ◽  
Evaluation Index ◽  
Cultural Industry ◽  
Spss Software ◽  
Industry Competitiveness

Based on the premise of an existing condition data, using factor analysis methods to build a cultural industry competitiveness evaluation index system and evaluation model, the corresponding indicators in the model will be evaluated at the final evaluation results. Statistical analysis using SPSS software, score differences in various parts of, analyses the major gaps.

scholarly journals Factor Analysis of Traffic Safety in Urban Roads Based on FTA-LEC

2018 ◽  
Vol 153 ◽  
pp. 052026
Author(s):  
TIAN Shuicheng ◽  
YANG Xingbo ◽  
SHEN Xiaoqing ◽  
ZHANG Detao
Keyword(s):  
Factor Analysis ◽  
Traffic Safety

scholarly journals Study of the Influence of Safety Factors by Performing Factor Analysis

2014 ◽  
Vol 9 (6) ◽  
pp. 272-276
Author(s):  
Abhijith Jacob ◽  
◽  
Jenson Joseph ◽  
Mahesh Rengaraj
Keyword(s):  
Factor Analysis ◽  
Safety Factors

Evaluation Index LPD of Highway Lighting’s Energy-Saving

2012 ◽  
Vol 178-181 ◽  
pp. 1628-1630
Author(s):  
Wei Li ◽  
Chuan Zheng Zhu ◽  
Yong Yang
Keyword(s):  
Energy Saving ◽  
Power Density ◽  
Traffic Safety ◽  
Calculation Method ◽  
Influence Factors ◽  
Road Surface ◽  
Evaluation Index ◽  
Lighting System ◽  
Road Lighting ◽  
Standard Value

LPD’s (lighting power density) definition, calculation method, standard value, influence factors and ways to reduce it are talked in this article. The aim is to take measures to reduce LPD properly. LPD should be less than standard value while guaranteeing traffic safety, average and uniformity road surface luminance. Then a road lighting system of energy-saving should be built as soon as possible.

An Evaluation and Analysis on High-Tech Industry Competitiveness in Fujian

2011 ◽  
Vol 403-408 ◽  
pp. 3281-3286
Author(s):  
Sheng Xu Shi ◽  
Sheng Yi Wu
Keyword(s):  
Cluster Analysis ◽  
Factor Analysis ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
High Tech ◽  
Regional Structure ◽  
High Tech Industry ◽  
Industry Competitiveness ◽  
And Cluster Analysis ◽  
Comprehensive Score

By establishing the high-tech industry competitiveness evaluation index system, we apply the factor analysis and cluster analysis methods to evaluation and analysis on high-tech industry competitiveness in East China of six provinces and one city. The result shows that the comprehensive score of Fujian stands at the lower level in the whole country, but the efficiency ability, innovation and effect ability factors rank up the average level. So we suggest that Government should adjust the industrial and regional structure, develop the high-tech industry branding and standardized and so on to promote the development of the high-tech industry and then improve its competitiveness in Fujian.

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