What happens if you run out of gas? Or have to go potty? http://www.chicagotribune.com/news/local/chi-traffic-jam_07_bothfeb08,1,2423978.story After being stranded for nearly 10 hours on a snowy Wisconsin interstate along with hundreds of other cars and trucks, Peter Freeman vowed Thursday to listen to his wife the next time a blizzard is brewing. ........ Snow accumulation along the clogged stretch of interstate reached as high as 21 inches, with drifts up to 4 feet high, officials said. At the height of the traffic backup, observers in National Guard helicopters counted 689 semitractor-trailers and 663 other vehicles stranded on the northbound interstate from just south of Janesville to Edgerton, according to the Wisconsin Emergency Management department. On the southbound interstate, 567 semitractor-trailers and 134 cars were stranded, the department said.