2. Goals definition

Analysis procedure presented here focuses on intersections: crossing and turning maneuvers create opportunities for vehicle-vehicle, vehicle-pedestrian, and vehicle-bicycle conflicts that may also result in traffic crashes. Certainly, human error is a contributing factor to road crashes; however, in addition to driver behavior, road engineering and design measures can also make intersections safer.

The work phases are shown in Figure 1.

In particular, the research steps are summarized as follows:

a. Evaluating a first measure of exposure to crash risk by using a procedure developed by the Italian National Research Council [12], shown in detail in Section 3.1 and in Figure 3, it is useful in ranking black intersections.

d.Identifying driver risk factors at hotspots by focusing on the mismatch between geometric design for each intersection and the requirements of the Italian Design Standard (Norme funzionali e geometriche per la costruzione delle intersezioni stradali, GU n. 70 del 24-7-2006) [14]; poor matching of the

Analytical Assessment of Effective Maintenance Operations on At-Grade Unsignalized…

DOI: http://dx.doi.org/10.5772/intechopen.86435

real configuration with the design requirements is reflected in greater consequent exposure to crash events and a lower level of service.

e.Managing risk levels at hotspots by hypothesizing structural adjustments keeping traffic features and environmental conditions constant. Two

without changing the configuration [15, 16].

• Adjusting the current geometric design to the Italian Design Standard

adjustments were proposed:

Methodological approach to plan safer strategies at intersections.

Figure 1.

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