Developing crash modification functions to assess safety effects of adding bike lanes for urban arterials with different roadway and socio-economic characteristics

Park, Juneyoung; Abdel-Aty, Mohamed; Lee, Jae-Young; Lee, Chris

doi:10.1016/j.aap.2014.10.024

Cited by 61 publications

(29 citation statements)

References 26 publications

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“…Differences between states in the same country [22] or cities in the same area [21] may result in poor model transferability. Similar issues emerged as well for CMFs [12,23], which were even perplexed by their possible variation with other road features (see e.g., [24]). Hence, SPFs and CMFs should be calibrated before their application in other contexts, or at least their possible transferability should be assessed.…”

Section: Background On Quantitative Methods For Road Safety Interventmentioning

confidence: 59%

An Integrated Design Framework for Safety Interventions on Existing Urban Roads—Development and Case Study Application

Colonna

Intini

Berloco

et al. 2019

Safety

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The need for improving urban road safety, livability, and sustainability is evident. Quantitative estimates and qualitative methods/strategies can be used by road safety practitioners to design safety interventions. This study proposes a flexible integrated design framework for safety interventions on existing urban road segments and intersections that integrates quantitative and qualitative methods. The proposed design framework is divided into four stages of the safety management process: End of Network Screening, Diagnosis, Selection of Countermeasures, and Economic Assessment. Pilot applications of the proposed method were performed on existing roads of the urban road network of the Municipality of Bari, Italy. Results from the application were useful to highlight some possible problems in the different stages of the design process. In particular, the discussed problems include a lack of crash and traffic data, difficulties with defining the road functional classifications, including rural-to-urban transitions, a lack of local inspection procedures, the recurrent problems from diagnosis, difficulties regarding the safety assessment of cycling infrastructures and sight distances, the criteria for grouping countermeasures into sets, and the choice of appropriate predictive methods. In response, appropriate solutions to the highlighted problems were presented. The usefulness of the proposed method for both practitioners and researchers was shown.

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Section: Background On Quantitative Methods For Road Safety Interventmentioning

confidence: 59%

An Integrated Design Framework for Safety Interventions on Existing Urban Roads—Development and Case Study Application

Colonna

Intini

Berloco

et al. 2019

Safety

View full text Add to dashboard Cite

show abstract

“…Although the safety effects of the London Cycle Superhighways have been rarely studied, a limited amount of studies have been conducted to examine the impacts of cycle lanes on collisions (e.g. Lusk et al, 2011;Teschke et al, 2012;Reynolds et al, 2009;Park et al, 2015;Zangenehpour et al, 2016;Pulugurtha and Thakur, 2015;Abdel-Aty et al, 2014;Chen et al, 2012). For example, Reynolds et al (2009) reviewed 23 studies of the impact of transportation infrastructure on cyclist safety.…”

Section: Figure 1 Routes Map Of the London Cycle Superhighwaysmentioning

confidence: 99%

“…Another review study by Thomas and DeRobertis (2013) conclude that one-way cycle tracks are generally safer than two-way, and constructing cycle tracks reduces collisions and injuries when effective intersection treatments are employed. Park et al (2015) employed both before-after with empirical Bayes and cross-sectional methods to determine relationships between the safety effects of adding a bike lane and the roadway characteristics. Ten years data from 2003 to 2012 for Florida is used in this study.…”

Section: Figure 1 Routes Map Of the London Cycle Superhighwaysmentioning

confidence: 99%

Safety effects of the London cycle superhighways on cycle collisions

Graham

Liu

2017

Accident Analysis & Prevention

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“…It is worth noting that the HSM provides the CMFs calculated based on the simple SPF only. However, the simple SPF is an oversimpli ed function to re ect the relationship between crash frequency and roadway characteristics since crash frequency is not only a ected by the tra c volume [48]. e cross-sectional method can be used to estimate and quantify the safety e ectiveness by taking the ratio of the average crash frequency of sites with the element to the average crash frequency of sites without the element [18].…”

Section: Cross-sectional Methods and Safety Performancementioning

confidence: 99%

Influence of Multiple Freeway Design Features on Freight Traffic Safety

Park

Abdel-Aty

Wang

et al. 2019

Journal of Advanced Transportation

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Since various freeway design features are simultaneously installed on roadways, it is important to assess their combined safety effects correctly. This study investigated associations between multiple roadway cross-section design features on freeways and traffic safety. In order to consider the interaction impact of multiple design features and nonlinearity of predictors concurrently, multivariate adaptive regression splines (MARS) models were developed for all types and freight vehicle crashes. In MARS models, a series of basis functions is applied to represent the space of predictors and the combined safety effectiveness of multiple design features can be interpreted by the interaction terms. The generalized linear regression models (GLMs) with negative binomial (NB) distribution were also evaluated for comparison purposes. The results determine that the MARS models show better model fitness than the NB models due to its strength to reflect the nonlinearity of crash predictors and interaction impacts among variables under different ranges. Various interaction impacts among parameters under different ranges based on knot values were found from the MARS models, whereas two interaction terms were found in the NB models. The results also showed that the combined safety effects of multiple treatments from the NB models over-estimated the real combined safety effects when using the simple multiplication approach suggested by the HSM (Highway Safety Manual). Therefore, it can be recommended that the MARS is applied to evaluate the safety impacts of multiple treatments to consider both the interaction impacts among treatments and nonlinearity issues simultaneously.

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Developing crash modification functions to assess safety effects of adding bike lanes for urban arterials with different roadway and socio-economic characteristics

Cited by 61 publications

References 26 publications

An Integrated Design Framework for Safety Interventions on Existing Urban Roads—Development and Case Study Application

An Integrated Design Framework for Safety Interventions on Existing Urban Roads—Development and Case Study Application

Safety effects of the London cycle superhighways on cycle collisions

Influence of Multiple Freeway Design Features on Freight Traffic Safety

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