Researchers at UI's National Advanced Driving Simulator are featured in a Canadian Broadcast Corp. segment on how smoking marijuana affects a person's ability to drive.

To watch the report, go to

A study conducted at the University of Iowa’s National Advanced Driving Simulator (NADS) found drivers who use alcohol and marijuana together weave more on a virtual roadway than drivers who use either substance independently. However, the cocktail of alcohol and marijuana does not double the effect of the impairment.