To assess the effects of cannabis on the ability required to ride a bicycle, repetitive practical cycling tests and medical examinations were carried out before and after inhalative consumption of cannabis. A maximum of three joints with body weight-adapted THC content (300 μg THC per kg body weight) could be consumed by each test subject. Fourteen regular cannabis-consuming test subjects were studied (12 males, 2 females). In summary, only a few driving faults were observed even under the influence of very high THC concentrations. A defined THC concentration that leads to an inability to ride a bicycle cannot be presented. The test subjects showed only slight distinctive features that can be documented using a medical test routinely run for persons under suspicion of driving under the influence of alcohol or drugs.
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This study was sponsored by VEGaS e. V. (Verein zur Erforschung der Gefahren durch Drogen und andere Rauschmittel im Straßenverkehr).
The experiments of this study comply with the current German laws. The study protocol was pre-approved by the ethics committee of the University Hospital Düsseldorf.
Conflict of interest
The authors declare that they have no competing interests.
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Hartung, B., Schwender, H., Roth, E.H. et al. The effect of cannabis on regular cannabis consumers’ ability to ride a bicycle. Int J Legal Med 130, 711–721 (2016). https://doi.org/10.1007/s00414-015-1307-y
- Ability to ride
- Ability to drive
- Driving under the influence
- Cannabis influence factor