Please use your common sense, motorbikes are banned from using this bridge for safety reasons as this accident shows. Just as they are banned from the center section of the Bang Na Trad road, but many do. The sign indicates B1000 fine for the offence. Of course IF bike riders would follow road rules, such as staying in the center of a lane at the speed limit instead of weaving in and out of traffic causing danger to themselves and other road users maybe the ban could be lifted.