A backhoe in Baltimore MD has set a new standard, and it was unmaned at
the time. It seems while as flatbed was transporting a backhoe around
the Baltimore Beltway (I-695), the backhoe hit a pedestrian bridge that
spaned the road. The bridge collapsed onto the road, killing 1 person and
sending 3 others to the hospital in critical condition.
Details are on the Baltimore Sun's web site at
http://www.sunspot.net/content/storyserver.cgi?storyid=1150080223022
Greg U
urban@cs.umbc.edu