I thought this was funny when they were explaining how dangerous driving high is.

"According to a study by the National Highway Traffic Safety Administration, a driver under the influence of alcohol and marijuana took an additional 46 yardsâ??almost half the length of a football fieldâ??to react to other drivers' changes. (Marijuana and Alcohol Combined Increase Impairment, NHTSA, June, 1999)."

Notice the test subject was drunk and stoned. Perhaps it was more the alcohol impacting his poor driving.

I drove a lot less drunk than stoned, yet I've been pulled over twice drunk (never got a DUI), yet have never been pulled over stoned. I suppose it suggests I drive good enough high.