Related Experiment Video
Updated: Dec 20, 2025
11:41
Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
Published on: February 1, 2020
20.8K
Revisiting freeway single tunnel crash characteristics analysis: A six-zone analytic approach
Amjad Pervez1, Helai Huang1, Chunyang Han1
1School of Traffic and Transportation Engineering, Central South University, Changsha, 410075, China.
Accident; Analysis and Prevention
|May 25, 2020
Summary
This study introduces a six-zone approach for analyzing freeway tunnel traffic safety, revealing distinct crash patterns in entrance, exit, and different tunnel lengths. The findings offer insights for improving tunnel safety engineering and policies.
Area of Science:
- Traffic Engineering
- Road Safety
- Transportation Science
Background:
- Previous tunnel safety studies often treated entrances and exits symmetrically and did not differentiate by tunnel length.
- A need exists for a more granular analysis of traffic crash characteristics within freeway tunnels.
Purpose of the Study:
- To investigate traffic crash characteristics in freeway single tunnels by analyzing entrance and exit zones separately.
- To examine how different tunnel lengths (long, medium, short) influence crash patterns.
- To propose and validate a novel six-zone approach for tunnel safety analysis.
Main Methods:
- A six-zone approach was developed to analyze traffic safety in freeway tunnels.
- Data from 156 single tunnels in Hunan province, China, were utilized for safety analysis.
- Crash rates, types, and contributing factors were compared between the proposed six-zone method and a conventional four-zone approach, also comparing different tunnel lengths.
Main Results:
- The six-zone method enhanced the understanding of tunnel crash characteristics compared to the four-zone approach.
- The most crash-prone zones varied by tunnel length: mid-zone for long tunnels, entrance zone for medium tunnels, and access zone for short tunnels.
- Specific crash causes were identified: failure to maintain safe distance at entrances (leading to rear-end crashes) and speeding/improper lane changes at exits (leading to sideswipe, rollover, and fixed-object collisions).
Conclusions:
- The proposed six-zone approach offers a more detailed understanding of freeway tunnel safety.
- Driver behaviors at tunnel entrances and exits contribute significantly to different types of crashes.
- Findings provide valuable information for engineering and policy interventions to improve freeway tunnel traffic safety.
Related Concept Videos
01:15Stress: General Loading Conditions
478
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
478
01:17Design Example: Analyzing Capacity Contours for Flood Risk Assessment
236
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
236
01:18Fault Types
349
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
349
01:15Design of Transmission Shafts - Stress Analysis
662
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
662
01:41Social Traps
26.2K
Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned...
26.2K
01:23Components of Stress
438
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
Interestingly, the hidden cube faces also experience these stresses, equal and...
438