Clear Rule

The rules around marijuana use can be confusing. But when it comes to marijuana use and driving, all you need to remember is one clear rule:

Driving impaired is illegal everywhere.

Driving impaired is illegal everywhere.

Everything else can get kind of hazy.

When you feel different, you drive different. Everything else can get kind of hazy. So, if you want to think through some of the things experts and leading researchers are learning about marijuana’s effect on your driving, you can do that here.
Index
Issue
6
Severity of Impairment
Subject

An analysis of 60 studies concluded that marijuana impairs the skills connected with the safe driving of a vehicle.

Why it matters?

Attentiveness, vigilance, perception of time and speed, and use of acquired knowledge are all affected by marijuana.

In fact, a meta-analysis of 60 studies concluded that marijuana causes impairment in every performance area that can reasonably be connected with safe driving of a vehicle, such as tracking, motor coordination, visual functions, and particularly complex tasks that require multi-tasking — although the research studies on how marijuana affects reaction time have been inconsistent.

Related Issues: Increased Crash Risk 2THC and Impairment 3

Clarity Level
High
Abstract
This study reviews the scientific evidence on the effects on driving while intoxicated with marijuana and contrast this with the effects of alcohol intoxication.
Abstract
This study reviews the scientific evidence on the effects on driving while intoxicated with marijuana and contrast this with the effects of alcohol intoxication.
This ranking indicates how “settled” we feel an issue is. Issues that are clear-cut, fully-researched, and conclusive have a “High” clarity level. Issues that are involved in ongoing research, or focus on matters that require additional study, have “Medium” or “Low” clarity levels — depending on the amount and strength of supporting research.