Hmmm...anyone with a JCVD avatar couldn't be wrong.:party0030:

I have a hwy/service road close by, I will clean my windows, throw the defroster on high and give a good highway run. Works very well ;)

Here, I'll even back up my statement with a citation from WiseGeek

http://www.wisegeek.com/what-is-safety-glass.htm

I lived in an apartment complex on a big hill. There was only one exit, which was at the bottom of the hill. The road to get out had tons of speed bumps. Leave snow on your car, drive a reasonable speed, then suddenly slow down for the speed bump and all the snow that was on your roof will now be on your windshield completely blocking your view. Saw it many times.