VIDEO - Crashing Into the Rear of a Commercial Trailer
I've always wondered how well the underride protection at the back of heavy commercial trailers would work, but I was never called on to investigate a collision like this. The Insurance Institute for Highway Safety (IIHS) has produced a video that shows these underride prevention structures provide poor protection when built to US standards and only slightly better protection when built to Canadian standards.

A green light doesn't always mean go unless you've had a good look to make sure that there are no hazards present before you proceed. Jennifer Biggers learned this when the vehicle she was driving collided with Carol Murdoch, who was crossing quickly in a marked crosswalk against a red light.