Self-explaining performance of visual guiding facilities in urban road tunnels based on speed perception

Based on the originally unprocessed data from the Official Platform of“110”Alarming Receiving Center (OP110ARC) of Shanghai Public Security Bureau (SPSB), 529 single-vehicle crashes reported during one year and a half which happened at the thirteen urban road tunnels going across the Huangpu River are used in this study. To investigate the factors affecting the crash influence severity levels, ordered probit regression is established. Several categories of factors are considered as explanatory variables in the models. The study finds that the entrance of the tunnels is the site where severe injury crashes trend to occur. Rainy and snowy days impose vehicles and motorists driving via the tunnel sections in danger. Tunnels with a low speed limit (40 km/h in this study) may be not as safe as we thought before. Two-wheel vehicles without sufficient physical protection for its drivers and heavy vehicles also show a negative effect on the operation safety of single-vehicle at these studied tunnels. Alcohol involved drivers are more likely to suffer from a severe crashes and gets badly hurt.

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Should We Expect a Disastrous Fire Accident in an Urban Road Tunnel? Literature Data Review and a Case Study for Selected Tunnels in Poland

Sustainability ◽

10.3390/su13116172 ◽

2021 ◽

Vol 13 (11) ◽

pp. 6172

Author(s):

Krystian Szewczyński ◽

Aleksander Król ◽

Małgorzata Król

Keyword(s):

Time Horizon ◽

Road Traffic ◽

Traffic Intensity ◽

Road Tunnel ◽

Urban Road ◽

Road Tunnels ◽

High Uncertainty ◽

Fire Outbreak ◽

Fire Accident

Urban road tunnels are a reasonable remedy for inconvenience due to congested road traffic. However, they bring specific threats, especially those related to the possibility of fire outbreak. This work is a case study for selected urban road tunnels. Considering tunnel specificity, road traffic intensity, and structure and based on the literature data for vehicle fire probability, the chances of a fire accident were estimated for selected tunnels in Poland. It was shown that low power tunnel fires could be expected in the 10–20-year time horizon. Although such threats cannot be disregarded, tunnel systems are designed to cope with them. The chances of a disastrous fire accident were estimated as well. Such events can occur when an HGV with flammable goods or a tanker are involved. Such accidents are fortunately very rare, but, on the other hand, that is the reason why the available data are scanty and burdened with high uncertainty. Therefore, a discussion on the reliability of the obtained results is also provided.

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Statistical Analysis of Traffic Accidents in Shanghai River Crossing Tunnels and Safety Countermeasures

Discrete Dynamics in Nature and Society ◽

10.1155/2014/824360 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 8

Author(s):

Linjun Lu ◽

Jian Lu ◽

Yingying Xing ◽

Chen Wang ◽

Fuquan Pan

Keyword(s):

Statistical Analysis ◽

Traffic Accidents ◽

Temporal And Spatial Distribution ◽

Urban Road ◽

Spatial Distribution Characteristics ◽

Road Tunnels ◽

Accident Data ◽

Tunnel Safety ◽

Temporal And Spatial ◽

Safety Countermeasures

A large number of traffic tunnel accidents have been reported in China since the 21th century. However, few studies have been reported to analyze traffic accidents that have occurred in urban road tunnels. This study aims to examine the characteristics of the temporal, spatial, and modality distributions of traffic in Shanghai river crossing tunnels using statistical analysis and comparative analysis. Employing these techniques tunnel accident data obtained from Shanghai center 110 was analyzed to determine temporal and spatial distribution characteristics of traffic accidents in river crossing tunnels in Shanghai. The results of this analysis are discussed and summarized in this paper. Identification of the characteristics of tunnel traffic accidents can provide valuable information for development of effective countermeasures to improve tunnel safety in China.

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Geotechnical investigations for urban road tunnels in Sydney

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(89)92879-9 ◽

1989 ◽

Vol 26 (3-4) ◽

pp. A219

Keyword(s):

Urban Road ◽

Geotechnical Investigations ◽

Road Tunnels

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Pressure-induced dipole theory and pressure pulsation in shallow urban road tunnels with top vents

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2019.103140 ◽

2020 ◽

Vol 95 ◽

pp. 103140

Author(s):

Sike Jin ◽

Jiali Jin ◽

Yanfeng Gong

Keyword(s):

Pressure Pulsation ◽

Urban Road ◽

Induced Dipole ◽

Road Tunnels

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Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China

Advances in Civil Engineering ◽

10.1155/2020/1686753 ◽

2020 ◽

Vol 2020 ◽

pp. 1-17

Author(s):

Weiwei Liu ◽

Jianxun Chen ◽

Yanbin Luo ◽

Zhou Shi ◽

Xiang Ji ◽

...

Keyword(s):

Carbon Monoxide ◽

Reduction Rate ◽

Emission Factors ◽

Pollutant Emission ◽

Passenger Cars ◽

Urban Road ◽

Road Tunnels ◽

Measurement Results ◽

Annual Reduction ◽

Co Emission

Environmental pollution and energy conservation in urban tunnels have become important issues that affect the scientific design and sustainable development of urban tunnels. The carbon monoxide (CO) concentration in urban road tunnels is regarded as a direct reflection and a useful tracer of the intensity of anthropogenic transportation activities. Previous studies in recent years have paid more attention to pollutant emission factors, but less to the calculation parameters of ventilation design for tunnels. This paper aims to study a reasonable annual reduction rate of CO base emission factors. Therefore, a detailed field measurement was carried out in the four typical urban road tunnels, Henglongshan Tunnel, Cejiexian Tunnel, Jiuweiling Tunnel, and Dameisha Tunnel in Shenzhen, China, from March 29 to September 16, 2014. Measurement results showed that the traffic flow of the four urban tunnels had been approaching the design value, or even beyond the limit. The average daily air velocities in the four tunnels were all within 5 m/s, whereas the maximum air velocity had exceeded the limit of 10 m/s. The CO concentrations in Henglongshan Tunnel, Cejiexian Tunnel, Jiuweiling Tunnel, and Dameisha Tunnel were 17 ppm, 7 ppm, 39 ppm, and 8 ppm, respectively. Moreover, it was found that the average CO emission factors of Henglongshan Tunnel, Cejiexian Tunnel, Jiuweiling Tunnel, and Dameisha Tunnel were 1.075 g/(km·veh), 1.245 g/(km·veh), 4.154 g/(km·veh), and 1.739 g/(km·veh), respectively. Based on the statistical data, the CO emission factors of mixed traffic and passenger cars decrease by an average of 16.4% and 33.3%, respectively, per year through the regression method and by an average of 17.4% and 29.0%, respectively, per year through the extremum method. Finally, when considering the safety factor of 20%, it is more reasonable for the CO base emission to adopt 4% as an annual reduction rate for ventilation design in urban tunnels.

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