Marijuana, Alcohol and Actual Driving Performance
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Marijuana, Alcohol and Actual Driving Performance

Filetype[PDF-2.74 MB]


  • English
    • Details You May Also Like

    Details:

    • Creators:
    • Corporate Creators:
      Rijksuniversiteit Limburg
    • Corporate Contributors:
      United States. National Highway Traffic Safety Administration
    • Subject/TRT Terms:
    • Publication/ Report Number:
    • DOI:
    • Resource Type:
      Research Paper
    • Geographical Coverage:
      United States
    • Corporate Publisher:
      United States. National Highway Traffic Safety Administration
    • Abstract:
      The purpose of this study was to empirically determine the separate and combined effects of Delta-9-tetrahydrocannabinol (THC) and alcohol on actual driving performance. This was the first study ever in which the drugs' combined effects were measured in a natural setting, i.e., on real roads in normal traffic. Eighteen subjects between 20 and 28 years of age who were licensed to drive an automobile and who smoked marijuana and drank alcohol at least once per month participated in the study. They were treated with drugs and placebo according to a balanced, 6-way, observer- and subject-blind, cross-over design. On separate evenings they were given weight-calibrated doses of THC and alcohol, or placebos for one or both substances as follows: alcohol placebo + THC placebo; alcohol placebo + THC 100 :g/kg; alcohol placebo + THC 200 :g/kg; alcohol + THC placebo; alcohol + THC 100 :g/kg; and, alcohol + THC 200 :g/kg. The initial alcohol dose was sufficient for achieving a peak blood alcohol concentration (BAC) of about 0.07 g/dl. Booster doses were later given to sustain BAC around 0.04 g/dl during testing. At each occasion, 30 minutes after smoking, subjects performed four driving tests in the evening hours after dark between 21:00 and 23:15: two repetitions of a Road Tracking Test and two repetitions of a Car Following Test. The former test measured the subjects' ability to maintain a constant speed of 100 km/h (62 mph) and a steady lateral position between the delineated boundaries of the right (slower) traffic lane. The latter test measured the subjects' reaction times and headway variability while driving 50 m (164 ft) behind a preceding vehicle that executed a series of alternating acceleration and deceleration maneuvers. Both THC doses alone, and alcohol alone, significantly impaired the subjects' Road and Tracking and Car Following performances. The magnitude of the mean effects were minor after alcohol and THC 100 :g/kg and moderate after THC 200 :g/kg. Both THC doses in combination with alcohol severely impaired the subjects' performance in both tests. While the effects of THC alone in doses up to 200 :g/kg might be categorized as "moderate", they become "severe" when THC is combined with a moderate dose of alcohol. /Abstract from report summary page/
    • Format:
      PDF
    • Collection(s):
    • Main Document Checksum:
    • Download URL:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at rosap.ntl.bts.gov

    Version 3.26