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Abstract
The primary objective of this research was to establish statistically valid mathematical models that can explain the variations in accidents as a function of geometric variables. Engineers and planners will be able to use these models to examine the sensitivity of accident rates to any of the independent variables, and then decide on the best improvement strategy that satisfies their goals and objectives. The second objective was to investigate the transferability of model parameters over time and space and develop a methodology to simplify the transfer process.