Under-reporting bicycle accidents to police in the COST TU1101 international survey: Cross-country comparisons and associated factors

Police crash reports are often the main source for official data in many countries. However, with the exception of fatal crashes, crashes are often underreported in a biased manner. Consequently, the countermeasures adopted according to them may be inefficient. In the case of bicycle crashes, this bias is most acute and it probably varies across countries, with some of them being more prone to reporting accidents to police than others. Assessing if this bias occurs and the size of it can be of great importance for evaluating the risks associated with bicycling.This study utilized data collected in the COST TU1101 action "Towards safer bicycling through optimization of bicycle helmets and usage". The data came from an online survey that included questions related to bicyclists´ attitudes, behaviour, cycling habits, accidents, and patterns of use of helmets. The survey was filled by 8655 bicyclists from 30 different countries. After applying various exclusion factors, 7015 questionnaires filled by adult cyclists from 17 countries, each with at least 100 valid responses, remained in our sample.The results showed that across all countries, an average of only 10% of all crashes were reported to the police, with a wide range among countries: from a minimum of 0.0% (Israel) and 2.6% (Croatia) to a maximum of a 35.0% (Germany). Some factors associated with the reporting levels were type of crash, type of vehicle involved, and injury severity. No relation was found between the likelihood of reporting and the cyclist´s gender, age, educational level, marital status, being a parent, use of helmet, and type of bicycle.The significant under-reporting - including injury crashes that do not lead to hospitalization - justifies the use of self-report survey data for assessment of bicycling crash patterns as they relate to (1) crash risk issues such as location, infrastructure, cyclists´ characteristics, and use of helmet and (2) strategic approaches to bicycle crash prevention and injury reduction. Fil: Shinar, D.. Ben Gurion University of the Negev; Israel Fil: Valero-Mora, P.. Universidad de Valencia; España Fil: van Strijp-Houtenbos, M.. Institute For Road Safety Research, Netherlands; Países Bajos Fil: Haworth, N.. Queensland University Of Technology Qut; Australia Fil: Schramm, A.. Queensland University Of Technology Qut; Australia Fil: de Bruyne, G.. Universiteit Antwerp; Bélgica Fil: Cavallo, V.. Ifsttar - French Institute Of Science And Technology For Transport, Development And Networks; Fil: Chliaoutakis, J.. Technologiko Ekpaideutiko Idrima, Kritis; Fil: Dias, J.. Instituto Superior Tecnico; Portugal Fil: Ferraro, O.E.. Universita Degli Studi Di Pavia; Fil: Fyhri, A.. Transportokonomisk Institutt; Fil: Sajatovic, A. Hursa. University Of Zagreb, Faculty Of Textile Technology; Fil: Kuklane, K.. Lund University; Suecia Fil: Ledesma, Ruben Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mascarell, O.. Ben Gurion University of the Negev; Israel Fil: Morandi, A.. Universita Degli Studi Di Pavia; Fil: Muser, M.. Working Group On Accident Mechanics; Fil: Otte, D.. Medizinische Hochschule Hannover (mhh); Fil: Papadakaki, M.. Technologiko Ekpaideutiko Idrima, Kritis; Fil: Sanmartín, J.. Universidad de Valencia; España Fil: Dulf, D.. Universitatea Babes-bolyai Din Cluj-napoca; Fil: Saplioglu, M.. Suleyman Demirel Universitesi; Fil: Tzamalouka, G.. Technologiko Ekpaideutiko Idrima, Kritis