From what I've experienced and one test done on the subject (I'll find the link to the study and repost it) driving high doesn't actually harm your ability to do normal driving, but if a situation came up (Such as a car about to hit you, or other unusual situations), you won't be able to react as quickly.

So you're probably safe if you're driving a few blocks from one house to another, but I'd recommend not driving high in any area that will take extra attention.
Bob the Awesome Reviewed by Bob the Awesome on . Driving BLAZED This isn't really a story or anything but is it just me or do you guys drive alot better really lifted? I love fucking getting high and driving around the city if I have to do shit at night. I never really toke in my car unless on a road trip so I never worry about being pulled over. But man o man to me it ALWAYS feels like I am on an airplane that is taking off the entire time. I love it. Post what ya guys feel like! Rating: 5