Originally Posted By: ZeeOSix
That's why driving while high is just as dangerous as driving while drunk. Perception can get really messed up (impairment), and that in turn leads to lots of opportunity to make major driving errors.
If people want to smoke weed, stay home and do it, but don't get behind the wheel of a car.
Worst that I ever drove was having picked up a permit to work on a turbine governor problem 5:30 AM Tuesday, and left site at 9:30AM Wednesday. Nothing more than a 15-20 minute break, a few times, coffee, ramen and canned soup.
24 hours in, felt shakey...at the time I got in the car, felt completely on top of it all.
When I'm driving, I pay attention, and have conversations about what that car at the next intersection MIGHT do, and prepare for it.
I had those conversations 50 yards AFTER I went past the threat. It scared the whoopee out of me as to how my judgement could have been so wrong.
Work tried to measure "impairment", rather than straight chemical loading, to try to capture the fatigue and personal element before introducing random D and A testing.
It threw about 1:6 applicants into the "impaired" basket for assessment and risk assessment...could have been anything from a bad night's sleep to excessive work hours, to any legal or illicit substance...straight chemical testing identifies about 1 per year in the fixed workforce.
Impairment is a lot more common that we, as an industrialised society is a lot more common than we would like to believe.
Again, not advocating vehicle use after substance use...just more awareness all round.
http://roadsafety.transport.nsw.gov.au/stayingsafe/fatigue/index.html
Good note point...asleep drivers don't steer or brake.