In the months September 1997 to January 1998, the SWOV Institute for Road Safety Research and eight police control teams conducted a roadside survey. The aim was to establish the motorists' alcohol consumption in the Dutch province of Gelderland. Blood alcohol content (BAC), age and sex of the drivers were collected and recorded. If the recorded BAC level was 0.7 promille or over, places of origin of the offenders were also collected and recorded. The study was carried out on Friday and Saturday nights. The 1997 sample included 2537 motorists. The collected data were analysed using the Weighted Poisson Model (WPM). The results of the 1997 survey are compared with the results of the 1996 survey in the province of Gelderland and with the results of the 1997 national survey.
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