Analytical Methods and Determinants of Frequency and Severity of Road Accidents: A 20-Year Systematic Literature Review

Figure 7

Variables related to the frequency and severity of road accidents for the (a) RTA + HA + SM, (b) RTA + HA + ML, (c) RTA + HA + SC, and (d) RTA + HA + GIS clusters. Here, solid dark arcs represent variables that contribute to the frequency and/or severity of road accidents, while gray arcs represent the variables that mitigate their frequency and/or severity.

(a)

(b)

(c)

(d)