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Abstract
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.