Effects of digital countdown timer on intersection safety and efficiency: A systematic review

Fu, Chuanyun; Zhang, Yaping; Qi, Weiwei; Cheng, Shaowu

doi:10.1080/15389588.2015.1043128

Cited by 15 publications

(13 citation statements)

References 18 publications

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“…Thirty-five (35) of the systematic reviews in the overview included studies from high-income countries. Only one review [ 50 ] included studies from high-income, upper-middle and low-income countries. One systematic review did not find any studies that met the inclusion criteria despite the search being updated twice [ 41 , 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of interventions for preventing road traffic crashes: an overview of systematic reviews

et al. 2022

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Background Road traffic crashes (RTCs) are among the eight-leading causes of death globally. Strategies and policies have been put in place by many countries to reduce RTCs and to prevent RTCs and related injuries/deaths. Methods In this review, we searched the following databases Ovid Medline, Embase, Cochrane Database of Systematic Reviews, Epistemonikos, Web of Science, and LILACS for reviews matching our inclusion criteria between periods January 1950 and March 2020. We did not apply language or publication restrictions in the searches. We, however, excluded reviews that focused primarily on injury prevention and reviews that looked at crashes not involving a motor vehicle. Results We identified 35 systematic reviews matching our inclusion criteria and most of the reviews (33/35) included studies strictly from high-income countries. Most reviews were published before 2015, with only 5 published between 2015 and 2020. Methodological quality varied between reviews. Most reviews focused on enforcement intervention. There was strong evidence that random breath testing, selective breath testing, and sobriety checkpoints were effective in reducing alcohol-related crashes and associated fatal and nonfatal injuries. Other reviews found that sobriety checkpoints reduced the number of crashes by 17% [CI: (− 20, − 14)]. Road safety campaigns were found to reduce the numbers of RTCs by 9% [CI: (− 11, − 8%)]. Mass media campaigns indicated some median decrease in crashes across all studies and all levels of crash severity was 10% (IQR: 6 to 14%). Converting intersections to roundabouts was associated with a reduction of 30 to 50% in the number of RTCs resulting in injury and property damage. Electronic stability control measure was found to reduce single-vehicle crashes by − 49% [95% CI: (− 55, − 42%)]. No evidence was found to indicate that post-license driver education is effective in preventing road traffic injuries or crashes. Conclusion There were many systematic reviews of varying quality available which included studies that were conducted in high-income settings. The overview has found that behavioural based interventions are very effective in reducing RTCs.

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Section: Resultsmentioning

confidence: 99%

Effects of interventions for preventing road traffic crashes: an overview of systematic reviews

et al. 2022

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“…The result from Opole city shows that would be better if drivers do not know the exactly time for ending the red signal. For Effects of countdown timers on traffic safety at signalized intersections example, countdown timer could only display counting of the rest of the signal without three last seconds (Fu, Zhang, Qi, & Cheng, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…The introduction of countdown timers at signalized intersections changes the way traffic control signals are perceived by drivers (Felicio, Grepo, Reyes, & Yupingkun, 2015, Huang, Fujita, & Wisinee, 2017Rijavec, Zakovšek, & Maher, 2013). Depending on the nature of the driver this may be a source of stress or motivation to act too quickly when the lights change, and could be the reason for dangerous incidents such as entries onto the intersection at red signals or rear end collisions (Devalla, Biswas, & Ghosh, 2015;Napiah, Koh, & Che Long, 2007, Botzoris, Papakatsikas, Profillidis, & Galanis, 2017Fu, Zhang, Qi, & Cheng, 2016;Biswas, Ghosh, & Chandra, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effects of countdown timers on traffic safety at signalized intersections

Kłos¹,

Sobota²,

Żochowska³

et al. 2020

ToTS

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Improving safety is one of the most important tasks of traffic engineering. In the road network, intersections are the places where conflicts most often occur. Therefore, these objects are of particular interest to engineers, designers and researchers. The possibilities of using modern technologies give a chance not only to achieve greater traffic efficiency, but also to ensure safe passing for all road users. One of such solutions are countdown timers, i.e. support devices for traffic lights which show the time (in seconds) remaining before the currently displayed signal on traffic light change. In some Polish cities those devices are installed on a growing number of intersections. However, the introduction of such new solutions without prior examination of their impact on safety is not recommended. The use of countdown timers at signalized intersections changes the way traffic control signals are perceived by drivers. To compare the impact of the device on the behavior of drivers, three different intersections have been selected depending on the function of the intersection in the transportation network. The measurements were made in two periods of research: for a week with enabled and disabled countdown timer devices. This article is a continuation of the previous research work carried out by the authors on determining the impact of the countdown timers on traffic conditions. The aim of this article is to show results of the analysis of the time distribution of vehicles entering the crossroads during the red signal for different type of the intersections. The results of the case study show that the countdown timer devices improve safety. Depending on types of intersections during the research with the enabled countdown timers from 22,65% to 32,03% less of the vehicles drove into the crossroads in a prohibited period.

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“…Safety characteristics of SCTs were investigated in [54] for not only a GSCT and an RSCT but also CCT a (continuous countdown timer-displaying all signals) The literature was researched using the PRISMA method and 79 references were analyzed, of which 14 were thoroughly investigated. It was found that the effect of countdown timers is dependent on the type of device, and different parameters in different studies indicated improvement or lack thereof.…”

Section: Safety (Number Of Crashes Vehicle-vehicle Conflicts)mentioning

confidence: 99%

Analysis of the Impact of Countdown Signal Timers on Driving Behavior and Road Safety

et al. 2021

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This article describes the safety and effectiveness issues related to signal countdown timers (SCT). These devices are used in many countries around the world. The impact of these devices on road safety and the effectiveness of traffic lights is presented. During a literature review, more than 18 aspects of device use were recognized. The research involved measurements carried out at three intersections in Płock (Poland). The initial and final period of the green signal for vehicles was analyzed. Headways, incidences of vehicles passing through after the end of the green signal, and red-light violations were examined. Additionally, a fuel consumption analysis and a case study of a road crash in Szczecin (Poland) are presented. Problems related to signal countdown timers working during traffic light failure are described. The research shows different influences of signal countdown timers at various intersections. It was observed that SCTs increase the number of red-light violations and during the red-amber signal. On the other hand, the number of entries during the amber signal with SCTs is lower. A literature review also indicated that the use of SCT causes a reduction of start-up time (positive impact) and increases vehicle speed (negative impact). The article concludes that SCTs do not always fulfill their role in improving road safety and control efficiency. Conclusions can address various stakeholders, including drivers, road authorities, and traffic engineers.

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Effects of digital countdown timer on intersection safety and efficiency: A systematic review

Cited by 15 publications

References 18 publications

Effects of interventions for preventing road traffic crashes: an overview of systematic reviews

Effects of interventions for preventing road traffic crashes: an overview of systematic reviews

Effects of countdown timers on traffic safety at signalized intersections

Analysis of the Impact of Countdown Signal Timers on Driving Behavior and Road Safety

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