The Maryland Senate unanimously approved a bill today that would alter the kind of equipment required in towing a vehicle, and would make a violation that results in serious bodily injury or death punishable by a fine of up to $1,000. The legislation was introduced after three people were killed and five others injured in May when seven vehicles collided on the Chesapeake Bay Bridge in the one of the worst accidents in its history. The pileup occurred after a trailer being towed by a sport utility vehicle broke loose and other drivers swerved to avoid impacts. An investigation by the Maryland Transportation Authority concluded that the safety chains used by the vehicle in the accident were too long for the trailer and that a hitch pin had apparently not been used. The Anne Arundel state's attorney found that there were no laws that would result in charges being filed.