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Advanced instruments and methods for street accident analysis

Keywords: road accident reconstruction and prevention
Fig. 1. Cinematic parameters concerning cyclist motion in a given situation (Author: Alfonso Micucci).
Fig. 2. Diagram of experimental survey of driver perception of pedestrian standing in the middle of the lane (Author: Alfonso Micucci).
Fig. 3. Logical scheme of data elaboration for driving behavior analysis (from OctoTelematics) (Author: Alfonso Micucci).
Fig. 4. Common OBD-II port (Author: Alfonso Micucci).

The recent introduction of street murder crime, as established by the law n. 41 of March the 23rd 2016, has raised the need of more accurate security force surveys, on the one hand, and of suitable instruments and methods for a more reliable recon-struction of street accidents, on the other hand.

In order to achieve this goal, the group of Forencis Engineers at DICAM has been engaged in a well-structured study concerning:

a) the definition of best practices for the survey execution directly on the accident place and the writing of a specific handbook for Judicial Police agents, that outdoes the considerable limits of the norm UNI 11472;
b) the experimental survey, based on direct ob-servation techniques, of cyclist modalities, with evaluation of the observance degree of generic and specific Traffic Laws, recognition of the most problematic situations and quantitative evaluation of cinematic parame-ters. These consist in speed and average ac-celeration (cfr. Fig. 1) relative to the operation typology (crossing, turning right, turning left), track typology (reserved or public track, in the second case with low or high in-terference probability with respect to further vehicle streams), as well as age range;
c) the experimental survey, based on simulation techniques, of car driver perception of pedestrian and cyclists in the most problem-atic conditions, with quantitative evaluation of perception distance and time of reaction (cfr. Fig. 2);
d) the study and the design of algorithms and numerical methods aimed at supporting the driving behavior analysis for car driver profil-ing (cfr. Fig. 3);
e) the experimental survey, based on computa-tional simulation techniques, on the percep-tion of direction change indicators of a given vehicle by bikers coming from the opposite direction or in the process of overtaking that vehicle;
f) the investigation about the typology of infor-mation processed by OBD-II drives (On Board Diagnostic, cfr. Fig. 4) of car vehicles and motorbikes, as well as about their acqui-sition and analysis methods;
g) the analysis concerning the reliability of our elaborated models through model checking techniques developed in mathematical logic for the evaluation of the security degree of those models and the recognition of possible critical situations.

Main publications

Micucci A., Strangi M., Prove di avvistabilità de-gli utenti deboli della strada in condizioni dinamiche – Egaf Edizioni, 2016

Micucci A., Strangi M., Analisi sperimentali della circolazione del ciclista – Egaf Edizioni, 2014

Micucci A., Strangi M., Determinazione sperimentale del tempo tecnico e della dece-lerazione in frenate d'emergenza – Egaf Edi-zioni.