If you are among the millions of Americans hitting the road this holiday weekend, you may want to pay closer attention to the others on the road.

Police say they are seeing more cases than ever of drugged drivers.

Unlike drunk drivers, the impaired offenders are often out in the morning and early afternoon hours, a time that some observers now call the “heroin rush hour.”

According to the Ohio Department of Transportation, the state has seen a 25 percent increase in drugged-driving crashes since 2012.

There have been more than 3,500 cases this year alone.

Police say one sign to look out for is drivers who rock back and forth in their lanes and come close to side-swiping others.

Should you witness that, they suggest contacting the Ohio State Highway Patrol directly by dialing #677 from your phone.