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This paper is devoted to the study of the time to line crossing (TLC) as a driver risk indicator. By definition, TLC is the time required for the vehicle, following its trajectory, to cross the lane. This definition has been adapted to fit vehicle sensors capacity, by simplifying the road description or (and) the vehicle trajectory. In this paper, by using a RTK GPS and an accurate map, we analyzed in detail on different scenarios these calculation aiming to validate them.