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Showing 25–43 of 19 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Impaired Driving Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Standardized Field Test for Marijuana Impairment II

NCT05115513
View directory record Official record
Conditions
Marijuana Impairment
Interventions
Medium THC, Placebo THC
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 55 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 8, 2025 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT
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 Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Objective Assessment of the Effects of Shift Work on Drowsiness and Driving Impairment in Hospital Staff

NCT01672489
View directory record Official record
Conditions
Impaired Driving, Sleep Driving
Interventions
Not listed
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 13, 2024 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

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

NCT03191084
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
20 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Jul 22, 2024 · Synced Jul 21, 2026, 7:11 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Fire Fighter Fatigue Management Program: Operation Fight Fatigue

NCT01672502
View directory record Official record
Conditions
Shift-Work Sleep Disorder, Insomnia, Restless Leg Syndrome, Obstructive Sleep Apnea, Impaired Driving
Interventions
Sleep health education provided via a web-based program, Sleep disorder detection and treatment, Optimization of Sleep in Fire Station
Behavioral · Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
620 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 16, 2016 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM 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 May 26, 2026 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT
Completed Phase 4 Interventional Results available

Delaying the Progression of Driving Impairment in Individuals With Mild Alzheimer's Disease

NCT00476008
View directory record Official record
Conditions
Alzheimer's Disease
Interventions
Memantine, Placebo
Drug
Lead sponsor
Florida Atlantic University
Other
Eligibility
60 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Boca Raton, Florida
Source: ClinicalTrials.gov public record
Updated Aug 10, 2014 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Driving Simulation to Assess Non-Sedative Effects of Tolperisone

NCT03353922
View directory record Official record
Conditions
Driving Impaired
Interventions
Cyclobenzaprine 10 Mg Oral Tablet, Placebo Oral Tablet
Drug
Lead sponsor
Neurana Pharmaceuticals, Inc.
Industry
Eligibility
21 Years to 55 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
2
States / cities
Long Beach, California • Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 31, 2022 · Synced Jul 21, 2026, 7:11 AM 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 Jul 21, 2026, 7:11 AM EDT