Methodology to Predict the Safety Performance of Urban and Suburban Arterials

Harwood, D W; Bauer, Karin; Richard, Karen R; Gilmore, D. K.; Graham, Jerry L; Potts, Ingrid B; Torbic, Darren J.; Hauer, Ezra

doi:10.17226/23084

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Another study on the safety of urban and suburban arterials in Minnesota considered three speed limit categories: low (30 mph or less), intermediate (35-45 mph), and high (50 mph or more). In almost all cases, higher crash occurrence was observed on lower speed arterials, which was thought to be caused by greater traffic flow turbulence resulting from the greater density of driveways on these segments (19).…”

Section: Posted Speed Limitmentioning

confidence: 95%

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Assessing Safety Performance on Urban and Suburban Roadways of Lower Functional Classification: An Evaluation of Minor Arterial and Collector Roadway Segments

Chakraborty

Gates

2022

Transportation Research Record: Journal of the Transportation R

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Previous research of urban roadway safety performance has generally focused on roadways of high functional classifications, such as principal arterials. However, roadways with lower functional classifications, including minor arterials and collectors, typically possess characteristics that differ from those of higher roadway classes. Therefore, assumptions made on the general effect of the predictor variables from typical safety performance functions may not apply to lower roadway classes. To address these knowledge gaps, a safety performance evaluation of urban/suburban minor arterial and collector roadway segments was performed using traffic and roadway data along with 8 years of crash data from 189 mi of two-lane urban and suburban roadways in Washtenaw County, MI. Mixed-effects negative binomial models with a segment-specific random intercept were developed for minor arterial and collector road segments, considering total-, fatal and injury-, and property damage only crashes. In general, minor arterial roadways showed greater crash occurrence compared with collector roads. Posted speed limit had a significant positive association with crash frequency, and this effect increased when the speed limit exceeded 40 mph. The effect of speed limit was stronger on minor arterial segments and for fatal and injury crashes. Additionally, driveway density was found to have a significant effect on safety performance, which was stronger for commercial/industrial driveways compared with residential driveways and for collector roads compared with minor arterials, particularly when considering residential driveways. On-street parking was associated with lower crash occurrence, with a stronger effect on collector roadways, most likely because of greater parking turnover when compared with minor arterials.

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Section: Posted Speed Limitmentioning

confidence: 95%

“…This a is termed the overdispersion parameter. In the safety impact analysis, negative binomial regression models have been widely used (18,19) and accepted as current practice for modeling crashes, as such models account for overdispersion.…”

Section: Mixed-effects Negative Binomial Regression Modelsmentioning

confidence: 99%

Assessing Safety Performance on Urban and Suburban Roadways of Lower Functional Classification: An Evaluation of Minor Arterial and Collector Roadway Segments

Chakraborty

Gates

2022

Transportation Research Record: Journal of the Transportation R

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Weights from a Safety Perspective for Interchange Lighting Prioritization

Pulugurtha¹,

Narayanan²

2015

J Transp Res Forum

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The focus of this paper is to research and update weights (values indicating the effect) to multiply ratings of selected factors used in the Total Design Process (TDP) for interchange lighting prioritization from a safety perspective. Results based on analysis using data collected at 80 interchanges along nine segments in North Carolina showed differences in weights for currently used factors such as freeway median width, freeway number of lanes and night-time traffic volume per lane. Results also showed that considering the number of night-time crashes by severity instead of night-to-day crash rate ratio, for prioritization of interchange lighting system installation or maintenance, would reduce the bias towards interchanges with fewer numbers of crashes and lead to better utilization of limited available transportation funds.

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Methodology to Predict the Safety Performance of Urban and Suburban Arterials

Cited by 2 publications

References 33 publications

Assessing Safety Performance on Urban and Suburban Roadways of Lower Functional Classification: An Evaluation of Minor Arterial and Collector Roadway Segments

Assessing Safety Performance on Urban and Suburban Roadways of Lower Functional Classification: An Evaluation of Minor Arterial and Collector Roadway Segments

Weights from a Safety Perspective for Interchange Lighting Prioritization

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