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Showing 1–24 of 43 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Impaired Driving Clear all
Not listed Phase 2 Interventional Accepts healthy volunteers

Cannabis Consumption and Driving Impairment Assessment on a Closed Course

NCT06059677
View directory record Official record
Conditions
Cannabis Smoking, Driving Impaired
Interventions
Active smoked cannabis, Placebo smoked cannabis
Drug
Lead sponsor
Bayliss J. Camp, PhD
Government
Eligibility
21 Years to 55 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Sep 28, 2023 · Synced Sep 4, 2026, 6:10 PM EDT
Not listed Phase 1Phase 2 Interventional

Video Feedback Intervention for Cognitively Impaired Older Drivers

NCT02600026
View directory record Official record
Conditions
Impaired Driving
Interventions
DriveCam, Feedback
Device · Behavioral
Lead sponsor
Rhode Island Hospital
Other
Eligibility
50 Years to 90 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated May 14, 2018 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Alcohol Impaired Driving: From the Laboratory to the Natural Environment

NCT03846050
View directory record Official record
Conditions
Drinking and Driving
Interventions
BAC feedback/warning, No BAC feedback/warning
Behavioral
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
21 Years to 35 Years
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 17, 2024 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

The Impact and Detection of Driving Impairments Associated With Acute Cannabis Smoking

NCT02849587
View directory record Official record
Conditions
Cannabis Intoxication
Interventions
Cannabis
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
21 Years to 55 Years
Enrollment
199 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jan 3, 2022 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Examine the Feasibility of a Standardized Field Test for Marijuana and Alcohol Impairment: Laboratory Evaluations

NCT04856566
View directory record Official record
Conditions
Marijuana Impairment, Alcohol Impairment
Interventions
Low Marijuana, Hash, THC, or Grass, High Marijuana, Hash, THC, or Grass, Placebo, 0.05 BAC Alcohol, 0.08 BAC Alcohol
Drug
Lead sponsor
Yale University
Other
Eligibility
21 Years to 40 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 30, 2025 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Phenytoin and Driving Safety: A Randomized, Controlled Cross-Over Study

NCT00581893
View directory record Official record
Conditions
Cognitive Measures, Driving Simulator Performance
Interventions
Phenytoin, Placebo oral capsule
Drug
Lead sponsor
University of Iowa
Other
Eligibility
25 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2008
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 30, 2021 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional

Speed of Processing Training in Adults With HIV

NCT02758093
View directory record Official record
Conditions
HIV, Cognition - Other, Impaired Driving
Interventions
Speed of Processing Training, Internet Navigational
Behavioral · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
40 Years and older
Enrollment
217 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 6, 2021 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Leveraging Transdermal Alcohol Monitoring to Reduce Drinking Among DWI Defendants

NCT03638596
View directory record Official record
Conditions
Drunk Driving
Interventions
Contingency Management, Control
Behavioral
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
21 Years and older
Enrollment
158 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated May 6, 2024 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Sedative-Anxiolytic Effects on Simulated Driving Performance

NCT03297944
View directory record Official record
Conditions
Psychomotor Impairment
Interventions
Alprazolam 2mg (2ALP/PLC), Alprazolam 1mg (1ALP/PLC), Alprazolam 0.5mg (0.5ALP/PLC), Zolpidem 10mg (ZOL/PLC), Placebo (PLC/PLC), Alprazolam 1mg (PLC/ALC)
Drug
Lead sponsor
Marion Coe
Other
Eligibility
18 Years to 50 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Jan 28, 2020 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 2 Interventional

Evaluation of an School-based Alcohol Prevention Program for Middle School Students

NCT01847183
View directory record Official record
Conditions
Alcohol-related Disorders, Drinking and Driving, Neurological Impairment
Interventions
Click City®: Alcohol
Behavioral
Lead sponsor
Oregon Research Institute
Other
Eligibility
12 Years to 16 Years
Enrollment
2,300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 5, 2016 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Project MADD - NIH Underage DUI and Ride

NCT03506880
View directory record Official record
Conditions
Underage Drinking, Driving Under the Influence, Drinking, Teen
Interventions
MADD Materials, Surgeon General Materials
Behavioral
Lead sponsor
Penn State University
Other
Eligibility
15 Years to 18 Years
Enrollment
2,352 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 28, 2023 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Validation of Driving Simulator to Blood Alcohol Concentration Standards for Impaired Driving

NCT00559819
View directory record Official record
Conditions
Driving, Intoxication, Impairment, Alcohol Impaired Driving
Interventions
placebo, Alcohol
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
21 Years to 80 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 13, 2022 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Reducing Cell Phone Use While Driving Among High Risk UBI Auto Policy Holders

NCT04587609
View directory record Official record
Conditions
Distracted Driving, Driving Impaired
Interventions
Free Phone Mounts, Commitment Contract, Personalized Habit Tips, Social Gamification Feedback, "Contest" Financial Incentives
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
1,668 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 1, 2021 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Preventing Impaired Driving Among Adolescents

NCT04959461
View directory record Official record
Conditions
Substance-Related Disorders
Interventions
webCHAT, Usual Care
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
15 Years to 17 Years
Enrollment
198 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
2
States / cities
Denver, Colorado • Dearborn, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Smartphone-paired Breathalyzers and Loss- and Gain-framed Texts for Reducing Drinking and Driving

NCT03335735
View directory record Official record
Conditions
Alcohol Drinking, Alcohol Intoxication, Alcohol Impairment, Drive, Driving Impaired, Driving Under the Influence, Behavior, Drinking
Interventions
Loss-framed text message, Gain-Framed text message
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
21 Years to 39 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 7, 2018 · Synced Sep 4, 2026, 6:10 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

The Rise of Ride Sharing Companies and Trends in Impaired Driving Accidents

NCT04564599
View directory record Official record
Conditions
Ride Sharing, Alcohol Drinking, Alcohol Intoxication, Drug Use, Motor Collision, Sexual Assault
Interventions
Not listed
Lead sponsor
Methodist Health System
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 22, 2026 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

An Interactive Text-Message Based Brief Intervention to Reduce Substance-Impaired Driving Among College Students

NCT03496129
View directory record Official record
Conditions
Alcohol-Impaired Driving
Interventions
Personalized feedback, Personalized feedback and text messages, Information Only
Behavioral
Lead sponsor
Western Kentucky University
Other
Eligibility
18 Years and older
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Bowling Green, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 10, 2025 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Validation of Alcohol Level Identification Using DRIVESC

NCT07282405
View directory record Official record
Conditions
Driving Impaired
Interventions
DRIVESC, Alcohol
Diagnostic Test · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 64 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Neuroscience of Marijuana Impaired Driving

NCT02757313
View directory record Official record
Conditions
Marijuana Impairment
Interventions
Low dose THC marijuana, High dose THC marijuana, Placebo marijuana
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 40 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Jul 22, 2024 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Assess the Effect of Metaxalone 640 mg (M640) Compared to Tizanidine 8 mg on Truck Driving Ability and Cognition

NCT06382662
View directory record Official record
Conditions
Cognitive Impairment
Interventions
metaxalone m640, tizanidine
Drug
Lead sponsor
Primus Pharmaceuticals
Industry
Eligibility
20 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Peoria, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 21, 2025 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Increasing Seat Belt Wearing and Decreasing Handheld Phone Use While Driving

NCT05469477
View directory record Official record
Conditions
Distracted Driving, Impaired Driving, Driving Behaviors
Interventions
Persuasive education, WOOP (aka, mental contrasting with implementation intentions., Wish, Outcome, Obstacle, Plan), Customized Habit Tips, Raffle Financial Incentive, Shared Pot Financial Incentive, Weekly SMS Support text, Weekly SMS Encouragement
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
1,139 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 2, 2023 · Synced Sep 4, 2026, 6:10 PM EDT
Not yet recruiting Phase 1 Interventional Accepts healthy volunteers

Examining the Role of Tolerance on Dose-dependent Effects of Acute THC on Oculomotor and Cognitive Performance

NCT06351540
View directory record Official record
Conditions
Cannabis Use, Impaired Driving, Cognitive Impairment
Interventions
Cannabis
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 13, 2026 · Synced Sep 4, 2026, 6:10 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Validation of the Drug Impaired Driving Scenario (DIDS) on the CRCDS-miniSim

NCT04970342
View directory record Official record
Conditions
Driving Behavior, Driving Under the Influence
Interventions
Placebo (Lactose) Capsule, 0.75 mg Alprazolam Capsule, Cannabis (6.18% THC / <0.025% CBD), Cannabis (0%/ THC / 0% CBD)
Drug
Lead sponsor
Timothy L. Brown
Other
Eligibility
19 Years to 45 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jul 24, 2023 · Synced Sep 4, 2026, 6:10 PM EDT