Safety Impacts of Differential Speed Limits for Trucks and Passenger Cars on Rural Interstate Highways: A Modified Empirical Bayes Approach

Garber, Nicholas J; Miller, John S.; Sun, X.; Yuan, Bo

doi:10.1061/(asce)0733-947x(2006)132:1(19)

Cited by 22 publications

(10 citation statements)

References 6 publications

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“…(7) with time-variant Ä, and any year during the before period can be used as the base year in Eq. (7), which ultimately leads to the same results as discussed in previous studies (Hauer, 1997;Persaud et al, 2003;Garber et al, 2006). By multiplying the correction ratio by the empirical Bayes estimate in Eq.…”

Section: Empirical Bayes Ba Studysupporting

confidence: 78%

“…The estimation results are summarized in Table 6. Although the model form is quite simple, it is reliable for simultaneously accounting for the change in AADT and time trend effects (Hauer, 1997;Lord and Persaud, 2000;Garber et al, 2006), Applying the estimated SPFs shown in Table 6, the values of in the BA study with a traffic flow correction ( F ) were calculated using:…”

Section: Ba Study With Traffic Flow Correctionmentioning

confidence: 99%

“…Assuming that the observed crash frequency in the tth year is Poisson distributed with parameter Ä t and the prior distribution of Ä 1 (underlying Poisson rate in the base year) is a gamma distribution with parameters˛andˇ, the expected value of Ä 1 given all available crash history (K) is expressed (Hauer, 1997;Persaud et al, 2003;Garber et al, 2006):…”

Section: Empirical Bayes Ba Studymentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of the Scottsdale Loop 101 automated speed enforcement demonstration program

Shin

Washington

Schalkwyk

2009

Accident Analysis & Prevention

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Section: Empirical Bayes Ba Studysupporting

confidence: 78%

Section: Ba Study With Traffic Flow Correctionmentioning

confidence: 99%

Section: Empirical Bayes Ba Studymentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the Scottsdale Loop 101 automated speed enforcement demonstration program

Shin

Washington

Schalkwyk

2009

Accident Analysis & Prevention

View full text Add to dashboard Cite

“…Too much speed loss for trucks may lead to larger speed difference between trucks and other vehicles. This may lead to more frequent overtaking operation for other vehicles, resulting in negative influence on the performance the overall traffic system [36][37][38][39]. Based the results obtained here, truck's speed decreases in a faster speed at a higher altitude; this negative effect together with the effect of gradient should be taken into consideration in future traffic safety management and highway geometric design in high-altitude area.…”

Section: Impact Of High-altitude On Test Truck's Deceleratingmentioning

confidence: 74%

Impact of High-Altitude on Truck’s Climbing Speed: Case study in Qinghai-Tibet Plateau Area in China

Tian

Jia

et al. 2019

Journal of Advanced Transportation

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Truck’s climbing performance is an important consideration in traffic safety, efficiency, and highway geometric design. With the infrastructure development in high-altitude area in China, more attention needs to be paid on truck’s climbing performance in such area. In this article, truck’s climbing speed in high-altitude area was examined through field tests on different grade sections at different altitudes. Truck’s speed-distance curves were built at different altitudes and the impact of altitude on truck’s climbing speed was explored based on the test results. It was shown that, within the altitude range of 3000~5000m, altitude had an obvious influence on test truck’s decelerating and accelerating performance. Truck’s speed decreased faster on steep grades and increased slower on gentle grades with the increase of the altitude. Also, the stable speed that test truck could maintain on a certain grade was lower at a higher altitude. In addition, test truck’s theoretical speed-distance curves at the sea level were estimated through truck’s dynamic model. Compared with the theoretical crawl speed, a negative effect of altitude change (from 0 to the altitude above 3000 m) was found on truck’s climbing performance.

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“…In this work it was found that changing from a uniform speed limit to a differential speed limit or vice versa had no impact on the mean speed and speed variance. In a later study by Garber et al (2006), a modified empirical Bayes framework was used to evaluate crash frequency changes for four policy groups, including a uniform speed limit, a differential speed limit, a change from a uniform to a differential speed limit, and a change from a differential to a uniform speed limit. The aggregate results of this work showed no consistent safety effects of differential speed limits when compared to a uniform speed limit.…”

Section: Differential Speed Limitsmentioning

confidence: 99%

Trucker Perceptions of Lane Restriction and Differential Speed Limit Policies on Freeways

Wolshon

Ishak

Yuan

et al. 2009

Journal of Transportation Safety & Security

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To improve the efficiency and safety of traffic flow on freeways, several states have implemented truck lane restriction and differential speed limit policies. The State of Louisiana introduced such restrictions on an 18 mile elevated four lane rural segment of Interstate 10 (I-10) in response to an 11 vehicle crash in September 2003. The new control policies, implemented in 2003, have restricted trucks to the right lane only and reduced their speed limit to 55 mph. At the same time the speed limit for passenger cars was also reduced from 70 mph to 60 mph. This article summarizes the findings of a survey to assess truck drivers' perceptions and opinions of these restrictive policies. Another objective of the survey was to solicit ideas and input for other potential strategies that could be useful to the drivers. Overall, the results showed that the truckers were not in favor of the restrictions and did not feel that a significant safety benefit was being gained from these restrictions.

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Safety Impacts of Differential Speed Limits for Trucks and Passenger Cars on Rural Interstate Highways: A Modified Empirical Bayes Approach

Cited by 22 publications

References 6 publications

Evaluation of the Scottsdale Loop 101 automated speed enforcement demonstration program

Evaluation of the Scottsdale Loop 101 automated speed enforcement demonstration program

Impact of High-Altitude on Truck’s Climbing Speed: Case study in Qinghai-Tibet Plateau Area in China

Trucker Perceptions of Lane Restriction and Differential Speed Limit Policies on Freeways

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