Effectiveness of graphic-aided portable changeable message signs in reducing vehicle speeds in highway work zones

Huang, Yilei; Bai, Yong

doi:10.1016/j.trc.2014.09.007

Cited by 27 publications

(8 citation statements)

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“…The summary of the vehicle speed reduction in phase I is presented in Combining such test results with the mean speed reduction profile, it was concluded that the graphic and text-graphic PCMSs reduced mean vehicle speed more effectively than the text PCMS from S1 to S5 and from S1 to S2, respectively (Huang and Bai, 2014). While the comparison suggested that the combination of text and graphic messages resulted in the least vehicle speed reduction, speed reduction analyses did not reveal the reason of such results due to the fact that driver information was not collected.…”

Section: Vehicle Speedmentioning

confidence: 98%

“…This paper synthesizes all findings of a two-phase research project. The results of vehicle speed analyses in both phases were presented in detail by Huang and Bai (2014) and were therefore only briefly introduced here. This paper primarily focused on the results of driver surveys in both phases as well as the impact of driver gender and age on speed reduction, which were not reported in previous publications.…”

Section: Introductionmentioning

confidence: 99%

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Driver responses to graphic-aided portable changeable message signs in highway work zones

Huang

Bai

2018

Journal of Transportation Safety & Security

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Portable changeable message signs (PCMSs) have been employed in highway work zones as temporary traffic control devices. Various studies showed that adding graphics to PCMS messages can provide advantages to traditional text messages, such as increasing legibility and improving the understanding of elderly drivers. This paper synthesizes the findings of a twophase research project aimed to investigate driver responses to graphic-aided PCMSs. Different text and graphic-aided PCMSs representing roadwork and flagger were set up in the upstream of highway work zones, and speed data of over 2,700 vehicles were collected with a series of five speed sensors to determine vehicle speed reduction. Nearly 1,000 on-site driver surveys were performed to identify driver preference on the added graphics. The results discovered that graphic-aided PCMSs reduced mean vehicle speed between 13% and 17%, and reduced the speed of passenger cars and trucks significantly differently depending on their locations in work zone. The results indicated that all drivers correctly interpreted the flagger graphic and two work zone graphics, and suggested that 52% to 71% of drivers preferred to see graphics in PCMS messages. The findings also revealed that driver age did not have a significant impact on driver preference on PCMS message format.

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Section: Vehicle Speedmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Driver responses to graphic-aided portable changeable message signs in highway work zones

Huang

Bai

2018

Journal of Transportation Safety & Security

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“…Besides only displaying text messages, an innovative way that may potentially improve the performance of the CMS is to show graphics along with text messages. Huang and Bai (2014) conducted the study to compare the mean speed reduction rates from using text CMS, text-graphic CMS and graphic-only CMS. It was suggested that traditional text-based CMS had several limitations such as having a short range of legibility and being difficult to read by elderly and non-Englishspeaking drivers.…”

Section: Graphic-aided Changeable Message Signmentioning

confidence: 99%

“…The study also found that lane closure information was used by the public and that lane closure messages displayed to the public should be carefully monitored to provide the most accurate information to drivers. Huang and Bai (2014) studied the effectiveness of portable changeable message signs with graphics on rural, two-lane highways in Kansas. Graphics of flaggers and construction workers were compared to messages with only text and a combination of graphics and text (Figure 3.27 and Figure 3.28).…”

Section: Its Use To Improve Traffic Operationsmentioning

confidence: 99%

Best Practices for Maximizing Driver Attention to Work Zone Warning Signs

Ukkusuri¹,

Gkritza²,

Qian³

et al. 2017

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the studies found reductions in vehicle speeds up to 10 mph.• Changeable message signs (CMS) are ideal for short-term and mobile work zones due to their portability. For CMS displaying text messages, innovative use of fonts and content may achieve greater speed reduction. Graphic-aided CMS are found to be more legible and recognizable compared with text-message CMS. The location of CMS has significant impact on the effectiveness of this technology; placing in advance of a work zone is recommended.• The presence of police cars may reduce car speeds by 4.4 mph and truck speeds by 5 mph (in a 45 mph speed zone). High-speed drivers are found to be more affected by police enforcement. Despite the effectiveness of CMS, "halo" effects and high costs are known to be the two main drawbacks of the technology. • Implementations of variable speed limit (VSL) resulted in reduced speed variance, increased speed compliance, and improved traffic throughput and Joint transportation research program

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“…8 Such message signs are particularly useful because not only do they get the attention of drivers, they have the capacity to transmit a number of clear messages in rotating cycles.…”

Section: Worker Safety In Construction Zonesmentioning

confidence: 99%

Impact of the decision-making environment on policy responses to road worker fatality in Manitoba and Saskatchewan

Pankratz

2017

Can J Public Health

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OBJECTIVES: Fatal accidents often lead to policy changes. However, the existing decision-making environment is critical to policy responses. This study compares the policy responses to similar events in Manitoba and Saskatchewan. The key question explores the extent to which the policy decisions in each province differ despite the similarity of the events.METHODS: Key documents were examined. Provincial court rulings, workplace health & safety incident investigation reports, court transcripts and police reports were used to compare resulting policy changes as well as the socio-political and economic decision-making context. Relevant clauses in resulting legislation were also compared to assess the specific changes that were made in each province. RESULTS:In each province, a young, female highway construction worker was killed. However, the provinces responded in very different ways. In Saskatchewan, the Premier called for recommendations to improve worker safety, initiating an in-depth governmental study and the development of a broad safety strategy. In Manitoba, political and social pressures shifted the decision-making environment and contributed to the rushed passing of a bill focused on traffic fine increases that resulted in record-breaking traffic fine revenue while failing to include broader safety measures.CONCLUSION: Different decision-making contexts can lead to vastly different policy outcomes even when responding to very similar events. Key differences included time constraints, access to information and the nature of the political process invoked.KEY WORDS: Safety; accidents; police; workplace; Manitoba; Saskatchewan La traduction du résumé se trouve à la fin de l'article.

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Effectiveness of graphic-aided portable changeable message signs in reducing vehicle speeds in highway work zones

Cited by 27 publications

References 1 publication

Driver responses to graphic-aided portable changeable message signs in highway work zones

Driver responses to graphic-aided portable changeable message signs in highway work zones

Best Practices for Maximizing Driver Attention to Work Zone Warning Signs

Impact of the decision-making environment on policy responses to road worker fatality in Manitoba and Saskatchewan

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