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Updated: Jun 2, 2026

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
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Published on: January 20, 2023

Exploring a Bayesian hierarchical approach for developing safety performance functions for a mountainous freeway.

Mohamed Ahmed1, Helai Huang, Mohamed Abdel-Aty

  • 1Department of Civil, Environmental and Construction Engineering, University of Central Florida, Engineering II - 215 Orlando, FL 32816, USA.

Accident; Analysis and Prevention
|May 7, 2011
PubMed
Summary
This summary is machine-generated.

Steep downgrades on rural freeways significantly increase crash risk, especially during snowy conditions. Wider medians and more lanes may reduce this risk.

Related Experiment Videos

Last Updated: Jun 2, 2026

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
14:55

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street

Published on: January 20, 2023

Area of Science:

  • Transportation Engineering
  • Road Safety Analysis
  • Traffic Management

Background:

  • Rural freeways typically have lower crash rates, but specific sections face increased risk due to complex interactions.
  • Mountainous terrain and adverse weather conditions are key factors influencing crash occurrence on certain freeway segments.

Purpose of the Study:

  • To examine the safety effects of roadway geometric characteristics on crash occurrence.
  • To investigate the influence of steep slopes and adverse weather on crash risk in a mountainous freeway section.

Main Methods:

  • Utilized Poisson models for preliminary analysis.
  • Developed Bayesian hierarchical models with spatial and random effects to model crash frequencies.
  • Incorporated 6 years of crash data, roadway geometry, traffic, and weather information.

Main Results:

  • Roadway geometry significantly impacts crash risk; steep downgrades drastically increase it.
  • Crash risk is significantly higher during snow seasons compared to dry seasons, particularly with steep grades.
  • Higher degrees of curvature, wider medians, and increased lanes are associated with lower crash rates.

Conclusions:

  • Steep downgrades are identified as major crash-prone locations on the studied freeway section.
  • Adverse weather, specifically snow, exacerbates crash risk in conjunction with roadway grades.
  • Roadway design elements like curvature, median width, and lane count are crucial for mitigating crash risk.