Drunk Driving

I'm spitting mad. Last night, we drove home from Michigan after a weekend at my parents. It was dark as we wanted to drive while our children slept (which, thankfully, they did!). We were about 1 hour from home, stopped for a brief pit/nursing stop and got back on the highway. We noticed an SUV in front of us that was swerving all over the road. Not just a little bit of swerving. A lot. We followed them for awhile, not wanting to get near them or pass them. I called 911 and reported that we were behind a drunk driver. The dispatcher responded immediately, which is reassuring to know in case of emergency on our end. They assured me that they would notify state police. We continued to follow them for about 20 minutes, and eventually were behind them in a toll booth. We were then able to record their license plate and the make of their car. I called 911 again to report this info. We were able to pass them shortly thereafter and I have no idea if they were pulled over. My guess is, they were not. This really, really freaked me out. I felt so scared being behind them, my heart was in my throat. I felt especially vulnerable with our two children in the car. This is the second time in a month that Steven and I have witnessed blatant drunk driving. I feel so angry about it. WHY WOULD SOMEONE JEOPARDIZE NOT ONLY THEIR LIFE, BUT THE LIVES OF OTHERS IN THIS WAY???? Drinking is a personal choice, it is no longer personal when someone gets behind the wheel. What can we do about this problem? I really hope the police responded...before this person seriously hurt themselves, or worse, someone else.