4.3 Treatment to manage and reduce the crash level by carrying out strategies able to improve the expected LoS and safety levels

The next step in the research was to design different geometric solutions (Figure 8) for intersection D (Figure 5), which has a high crash rate, medium-high crash cost, low-medium LoS (Table 5) and to estimate, on the one hand, the expected LoS and, conversely, the expected reduction of the annual crash frequency of the configurations hypothesized. The solution shown in Figure 8a is an adaptation of intersection D to the requirements of the Italian Road Design Standard on the geometric design of road intersections [14]. The solution shown in Figure 8b refers to transforming the shape into a compact roundabout.
