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"Real-time monitoring of drug driving patterns – Results of the German Smartphone Survey". German title: „Zeitnahe Protokollierung von Drogenfahrten – Ergebnisse der Deutschen Smartphone Studie“.

Authors: Martina Walter, Florian Fischer, Volker Hargutt, Hans-Peter Krüger IZVW (Center for Traffic Sciences) Department of Psychology University of Würzburg Objectives: The study intended to obtain information about the frequency of drug driving and to specify characteristics of drug impaired drivers for rehabilitation and prevention purposes. Methods: The sample consists of 200 drug users and 100 controls out of the normal driving population stratified for sex, age (18-39 years) and residence (rural, urban and city area). To capture real-time data about drug consumption and driving a repeated-entry diary technique was applied. A questionnaire was installed on Smartphones and was daily filled in for 28 consecutive days. All activities were listed in chronological order with the focus on drug consumption and driving. Encrypted data were transmitted via GPRS and the internet. Immediately after reception, data were checked for consistency by study assistants, in case of inconsistencies or peculiarities discussed by phone and corrected if necessary. Results: The reported drug consumption and driving data were comparable to existing drug prevalence and mobility data of the general German population. The synchronisation of the data about drug use and

driving not only offers to assess the frequency of drug driving (i.e. prevalence rates for the general German driving population) and the situational aspects of such incidences (e.g. time, day, distance, companions). It also enables to investigate preventive factors that lead to refrain from driving under influence. Furthermore, an extended diagnostic part was included in the study to gather person-related driver characteristics (e.g. socio-demographic information, relevant previous experiences, personality variables and attitudes). Conclusion: The new methodological approach of the present study provides valid data and was well accepted by the participants. The study casts new light on the phenomenon of drug driving by providing detailed information about preventive and promotive circumstances. Disclaimer:

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This report has been produced under the project “Driving Under Influence of Drugs, Alcohol and Medicines” (DRUID) financed by the European Community within the EU 6th Framework Program. This report reflects only the author's view. The European Community is not liable for any use that may be made of the information contained therein.

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