Turner-Fairbank Highway Research Center

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NCHRP Project 5-19, "Analysis of Safety Effects for the Presence of Roadway Lighting"

Product Type

Research Report


Donnell, E.T., V. Shankar, and R.J. Porter




This report includes a summary of a statistical analysis to evaluate the association between the presence of fixed roadway lighting and crashes at intersections, interchanges, and along freeway segments. Electronic roadway inventory data were appended to crash and lighting presence data from several state transportation agencies. The presence of roadway lighting, geometric design, and traffic control features were included in statistical models of nighttime and daytime crash frequency. Night-day crash ratios from negative binomial regression and log-linear models were compared to night-day crash ratios computed only from crash data. The results indicate that the night-day crash ratios are lower at intersections with fixed roadway lighting when compared to intersections without lighting, when controlling for various roadway and traffic control features present at intersections. When computing the night-day ratios at interchanges and along freeway segments, it could not be concluded in the present study that the presence of fixed roadway lighting is associated with a statistically significant reduction in the night-day crash ratio.

Link To Research Report

NCHRP Project 5-19, "Analysis of Safety Effects for the Presence of Roadway Lighting"

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