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Abstract. Highlights the shortcoming of using a ggregate data as a whole with the assumption of similar lane -usepattern over lanes, traffic variations are attentively investigated to explore traffic dynamics distribution both in laneutility in efficiency and safety performance lane-by-lane. In this paper, above two dimensions are examined for each of five mainline lanes on Highway 101 in Angeles using Next Generation Simulation (NGSIM) data. T he lanespecific data is statistically processed to reflect lane utility in lane flow param eters along the location and identify Lane Risk Coefficient by verifying degree of consistence vehicles operation with 'Assured Clear Distance Ahead' criterion. It appears completely new that the most-middle lanes are similar utilized under congested conditions compared to two sides of the lanes, as well as the quite close values of L RC to reveals an uniformly safety level between Lane 2 and Lane 3. T he findings of this study are intended to be relevant with the calibration of microscopic simulation models and suggest implementing a proper variable speed towar d under-utilized shoulder Lane 5 but with worst safety performance.

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