The hotspot and clusters mainly persisted in Downtown and Scarborough in most conditions, though the reasons for the formation may vary.  Downtown undertakes the role of the city’s commercial, financial and recreational center. Dense streams of migrant people and vehicles require a dense network of roads, thus results in an overall high clustered fatal traffic accidents (Figure 1). However, when we count numbers, the downtown area did not show much more large counts than other fields, the fatal crashes happened in downtown were mostly randomly distributed on different roads and intersections, presenting in maps by small but dense dots. Scarborough is featured in the industrial area and dendritic road system (Figure 2). Though the specific correlation between zoning, road structure, and traffic severity is yet not confirmed, we doubt the impact of the road system on fatality based on the similar clusters at intersections for Scarborough, Steeles, and Malton (Figure 2).  The complex road system may increase the likelihood of fatal accidents. In terms of different causations of hotspots in the two regions, our suggestions were various. The potential strategy in downtown is to reduce the road density by closing or narrowing the significant roads and controlling the traffic volume for rush hours. For Scarborough, since several intersections show a high frequency of fatal traffic accidents, the necessary monitor should be added to these dangerous intersections (Figure 2). Also, roundabouts could be an effective way to reduce the crashes at the intersection in the less urban area.