as macroscopic variables at traffic analysis zone (TAZ) level for 279 intersections were used for analysis
Buffer width as a case study.
Intersection safety Results: Among the findings are: (1) the sets of significant variables in crash-frequency analysis differed for
different transportation modes; (2) omission of macroscopic variables would result in biased parameters
estimation and incorrect inferences; (3) the zonal factors (macroscopic factors) considered played a more
important role in elevating the model performance for non-motorized than motor-vehicle crashes; (4) a
relatively smaller buffer width to extract macroscopic factors surrounding the intersection yielded better
estimations.