Effects of cannabis and mixed use with alcohol on road safety

Status

Recruiting

Phases

Unknown

Study type

Observational

Source

DRKS

Registry ID

DRKS00034317

Enrollment

4500

Registered

2024-10-17

Start date

2024-11-01

Completion date

Unknown

Last updated

2026-04-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

road safety

Interventions

Group 1: On the basis of the planned study, the effects of cannabis and mixed consumption with alcohol on road safety will be examined using three independent work packages (sub-studies), traffic acci

Eligibility

Sex/Gender

All

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: - Presence of a traffic accident with personal injury within the jurisdiction of Freiburg Police Headquarters, - Substances: THC, alcohol and other centrally active substances.

Exclusion criteria

Exclusion criteria: - If the above inclusion criteria are not met.

Design outcomes

Primary

Measure	Time frame
Aim of the study (as no conventional endpoint) Sub-study 1: 500 cases (serious traffic accidents within the jurisdiction of Freiburg Police Headquarters) Sub-study 2: Number of cases 1,000 (cases in the jurisdiction of Freiburg Police Headquarters from 2022-2024 in which there was either a violation of Section 24a StVG or a violation of Sections 315c, 316 StVG with cannabis or alcohol and cannabis) Sub-study 3: Number of cases 3,300 (online survey; 3,000 regular cannabis users + 300 current non-cannabis users)	—

Measure

Time frame

Aim of the study (as no conventional endpoint) Sub-study 1: 500 cases (serious traffic accidents within the jurisdiction of Freiburg Police Headquarters) Sub-study 2: Number of cases 1,000 (cases in the jurisdiction of Freiburg Police Headquarters from 2022-2024 in which there was either a violation of Section 24a StVG or a violation of Sections 315c, 316 StVG with cannabis or alcohol and cannabis) Sub-study 3: Number of cases 3,300 (online survey; 3,000 regular cannabis users + 300 current non-cannabis users)

—

Countries

Germany

Contacts

Public ContactVolker Auwärter

Institut für Rechtsmedizin

volker.auwaerter@uniklinik-freiburg.de+49 761 2036867

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: May 1, 2026