HAS of car upside down, police, bystanders. HAS of car hitting guard rail, dropping off open end of elevated expressway. Shots of two cars after collision, of damage to cars, of damage to guard rails. Various shots of men working on guide track. More shots on collisions with guard rail, men inspecting damage. Name of safety consultants can be seen on car doors in some shots. Two shots of light traffic on elevated highway and ramp.