Rijden onder invloed in de provincie Zuid-Holland, 1993-1994 : het alcoholgebruik van automobilisten in weekendnachten. In opdracht van Directoraat-Generaal Rijkswaterstaat, Adviesdienst Verkeer en Vervoer AVV en Directoraat-Generaal Rijkswaterstaat, Directie Zuid-Holland.

In the fall of 1994, 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 South Holland. 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 and, for the first time, in the afternoon and in the evening. The 1993 sample included 2493 motorists. The results of the 1994 night survey are compared with the results of the 1993 night survey, with the results of the 1994 national night survey and with the 1994 afternoon/evening survey in South Holland