No. I've driven high, the intoxication factor isn't the same while high as it is drunk. While drunk inhibitions are lost, vision blurs, judgement impaired -
High - from my experience and that of people I know - it is laziness and hunger and giggles, as well as a short attention span. But most of that attention occurs during conversation, if you pop on a movie or drive, there is something to zone out on and you focus almost mindlessly on driving. Although you're likely to find yourself going 10 mph too slow rather than speeding and swerving.
You can't really compare these two things - alcohol and weed because their affects are extremely different. Yes you are inebriated under both but stating that in a vague manner is little more than a method of swaying opinion - because really how many people are going to go research something like that just because a news reporter doesn't make it clear?