Safety Investigation and Analysis for Highway Tunnel Entrance Pavement

2011 ◽  
Vol 311-313 ◽  
pp. 293-296
Author(s):  
Xiao Xia Jiang ◽  
Yong Shen Hu
Keyword(s):  
Traffic Accidents ◽  
Transition Section ◽  
Highway Tunnel ◽  
Pavement Structure ◽  
And Function ◽  
Tunnel Entrance

Based on the investigation and analysis on the pavement structure, material and traffic accidents of highway tunnel, security and function of transition section at highway tunnel’s entrance and exit are analyzed, and some useful suggestions for tunnel’s transition pavement structure are given in this article.

scholarly journals Discussion on Landscape and Greening Technology of Highway Structural Tunnel Entrance

2021 ◽  
Vol 261 ◽  
pp. 03035
Author(s):  
Liu Ming ◽  
Liu Zhiqiang ◽  
Qiang Rongrong
Keyword(s):  
Cultural Landscape ◽  
Practical Stability ◽  
Tunnel Engineering ◽  
Portal Area ◽  
Highway Tunnel ◽  
Exposed Part ◽  
Tunnel Portal ◽  
Tunnel Entrance

Highway tunnel entrance is not only the exposed part of mountain in the tunnel engineering, but also an integral part of the highway breaking through the mountain. On the premise of ensuring the safety of tunnel entrance, it is important to realize the unity of safety and practical “stability” and landscape greening “beauty” of the expressway tunnel through reasonable aesthetic landscape greening design. In combination with the topographic and geomorphological conditions as well as the regional and humanistic conditions of the highway tunnel portal area, this paper introduces the cultural landscape and plant greening engineering of highway tunnel entrance by reference to the successful experience of tunnel entrance landscape greening, and puts forward the requirements for landscape and greening technology of highway tunnel entrance in accordance with the provisions of relevant regulations.

Optimization Design of Shading Shed Transmittance in Highway Tunnel Entrance

2012 ◽  
Vol 605-607 ◽  
pp. 24-27
Author(s):  
Guo Chun Zhang ◽  
Han Bai ◽  
Hao Xue Liu ◽  
Bin Hua Zhang
Keyword(s):  
Quantitative Analysis ◽  
Optimal Design ◽  
Optimization Design ◽  
Qualitative And Quantitative Analysis ◽  
Design Algorithm ◽  
Qualitative And Quantitative ◽  
Highway Tunnel ◽  
Analysis Methods ◽  
Visual Characteristics ◽  
Tunnel Entrance

Shading shed transmittance of highway tunnel entrance should be designed to be compatible with the driver visual characteristics. By using qualitative and quantitative analysis methods, change law between pupil area and illumination was found through driver visual characteristics experiments in tunnel entrance. Optimal design algorithm of shading shed transmittance in highway tunnel entrance was established. Nanwutai tunnel on Baotou to Maoming highway are selected as research case to prove the model. The results of this study provide evidence that the model has obvious superiority.

scholarly journals The Driving Risk Analysis and Evaluation in Rightward Zone of Expressway Reconstruction and Extension Engineering

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Chi Zhang ◽  
Bo Wang ◽  
Shaoxiang Yang ◽  
Min Zhang ◽  
Quanli Gong ◽  
...  
Keyword(s):  
Traffic Accidents ◽  
Safety Management ◽  
Evaluation Model ◽  
Risk Index ◽  
Traffic Volume ◽  
Entropy Method ◽  
Simulation Software ◽  
Evaluation Index ◽  
Transition Section ◽  
Driving Risk

In the expressway reconstruction and expansion engineering, the form of rightward zone is increasingly adopted, and its complicated traffic conditions can easily cause traffic accidents. In order to quickly and effectively grasp the traffic risk of the right diversion section, this study employs average speed, the coefficient of variation, the equivalent minimum safety distance, and the deceleration as evaluation indexes of driving risk, and then analyses the influence rules of traffic volume, the proportion of large vehicles, and the length of the transition section on each evaluation index by using Vissim simulation software. On the basis of this, we determine the weight of each evaluation index by the entropy method and establish the driving risk index evaluation model of the work zone with multiple linear regression. The results show that the partial regression coefficients of traffic volume, the proportion of large vehicles, and the length of the transition section to the driving risk index are 0.059, 0.317, and 0.15, respectively. Finally, in this paper, we analyze the traffic risk of example section based on the driving risk evaluation model. The results of evaluation are consistent with the number of measured conflicts. This study proposes a new method for predicting the traffic risk of the expressway reconstruction and extension engineering, which can provide a reference for the development of safety management measures in the rightward zone.

scholarly journals Visual Characteristics of Drivers at Different Sections of an Urban Underpass Tunnel Entrance: An Experimental Study

2021 ◽  
Vol 13 (9) ◽  
pp. 5224
Author(s):  
Fangtong Jiao ◽  
Zhigang Du ◽  
Haoran Zheng ◽  
Shoushuo Wang ◽  
Lei Han ◽  
...  
Keyword(s):  
Experimental Study ◽  
Traffic Accidents ◽  
Fixation Time ◽  
Time Threshold ◽  
Line Section ◽  
Straight Line ◽  
Visual Characteristics ◽  
The Difference ◽  
Real Vehicle ◽  
Tunnel Entrance

The increase in the number of traffic accidents due to the increasing number of urban underpass tunnels necessitate a better investigation of drivers’ visual characteristics when entering the tunnels. A total of 20 drivers were gathered to perform a real vehicle experiment in an urban underpass tunnel. The saccade angle, saccade frequency, and fixation time were selected as the research indexes. The urban underpass tunnel entrance was divided into five sections, namely the external straight line section, the upper half of the ramp, the lower half of the ramp, the shading shed section, and the entrance inner section. The results showed that the saccade angle and frequency of the ramp were significantly smaller than that of the external straight line and the tunnel interior, and the saccade range in front of the entrance was more concentrated. The changes in fixation time and the difference range of 15th-85th fixation time threshold in each section were analyzed. The fixation time of all sections was distributed within the range of 149.476 to 475.414 ms. The driver’s fixation was more and more concentrated when the sidewalls were higher and closer to the portal.

scholarly journals Safety Evaluation of Highway Tunnel-Entrance Illuminance Transition Based on Eye-Pupil Changes

2014 ◽  
Vol 26 (5) ◽  
pp. 363-370
Author(s):  
Zhigang Du ◽  
Hongliang Wan ◽  
Chaozhong Wu ◽  
Xiaodong Pan
Keyword(s):  
Critical Velocity ◽  
Safety Evaluation ◽  
Quantitative Relationship ◽  
Test Results ◽  
Eye Tracker ◽  
Highway Tunnel ◽  
Ideal Curve ◽  
Function Relationship ◽  
The Relationship ◽  
Tunnel Entrance

Utilizing the EMR-8B eye-tracker system, the pupil changes of eight drivers were monitored when they drove through 26 typical highway tunnels. Based on the test results, the driver’s pupil areas and pupil illuminance were found to be in a power function relationship at tunnel entrances. Furthermore, a quantitative relationship between the pupil area and its critical velocity was established, and the ratio of pupil area’s velocity in relation to its critical velocity was used to evaluate the lighting transitions and to establish the ideal curve of pupil illuminance at tunnel entrances. The results demonstrated that the relationship between the pupil illuminance of the tunnel entrance and the driver’s pupil areas conforms to the Stevens law found in experimental psychology; severe pupil illuminance transition within the range of 10 metres of the existing highway tunnel entrances, which results in great visual load, is in urgent need of improvement.

scholarly journals Investigating the Importance of Tunnel Lighting and its Role in Reducing Traffic Accidents

2021 ◽  
Vol 3 (29) ◽  
pp. 39-57
Author(s):  
Massoud Danishmal ◽  
◽  
Zainullah Serat ◽  
Keyword(s):  
Traffic Safety ◽  
Traffic Accidents ◽  
System Failure ◽  
Road Accidents ◽  
Lighting System ◽  
Key Factors ◽  
Road Tunnels ◽  
The World ◽  
Risk Potential ◽  
Tunnel Entrance

Traffic safety is a major concern worldwide. Road accidents are the ninth leading cause of death in the world. Tunnel accidents are less common than road accidents. However, the severity of the accidents is more severe. One of the key factors in preventing accidents in road tunnels is proper lighting system. Failure to pay attention to this issue causes the phenomenon of black hole when approaching the tunnel, visual mismatch inside the tunnel and the phenomenon of glowing hole when leaving the tunnel. The creation of these factors has increased the risk potential at the entrance and exit of the tunnel up to 4 times the middle area of the tunnel. At the entrance to the tunnel, the reflection of sunlight from the surroundings and the lack of sufficient light usually cause some vision problems. It may lead to drivers' eyes not adapting to changing the brightness level at the tunnel entrance, thus increasing the risk of road accidents in this area. The aim of this study was to evaluate the lighting safety in very long road tunnels based on the visual adaptation of drivers in the tunnels. In this paper, first, generalities about tunnel safety are stated and using the CIE88-2004 standard, the required luminosity in the threshold, transition, interior and exit areas of the tunnel is designed. Finally, solutions are proposed to increase the safety of tunnels.

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