Factors Affecting Classification of Road Segments into High-and Low-Speed Collision Regimes

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  • The safety of locations operating under high-speed conditions could significantly differ from that of locations operating under low-speed conditions. Therefore, different approaches must be adopted when analyzing and managing speed and safety at locations operating under different regimes. However, first it is necessary to understand the factors affecting which speed-collision classification a site falls under. Locations operating under high speeds are typically expected to have more collisions compared to locations where speeds are low. Some locations, however, might experience a high collision rate even when speeds are low, or vice versa. This paper aims to identify the factors that affect a sites classification into any of those categories, using data collected at roads in Edmonton, Canada. Locations are divided into four speed-collision bins (high collision, high speed; high collision, low speed; low collision, high speed; low collision, low speed) and GIS maps of locations are produced to explore the spatial distribution of those locations. Moreover, logistic regression is used to understand the role different factors play in identifying the speed-collision bin a certain location belongs to. The results reveal that locations with a high collision rates but low speeds, have a relatively high population of heavy vehicles and trucks as well as high speed variability. As for locations with a low collision rates at high speeds, these sites were found to have a high level of protection through the presence of medians and shoulders with relatively low access density.

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    Article (Draft / Submitted)
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    Attribution-NonCommercial-NoDerivatives 4.0 International