In the past 10 years, 35,000 people in Taiwan have died in traffic accidents, over 3 million have received injuries, 400,000 of which were severe. It is estimated that the total cost of these accidents including medical expenses is around 15 billion USD, equivalent to 3.17 percent of annual GDP. This is also the same cost for the construction of an entire high speed rail line.
....Although scooter riders enjoy low costs, that is only because the costs of externalities such as causing pollution, endangering safety, emitting noise, and health related expenses have not been internalized. Scooter riders are currently only paying 1/3 of the price they should be paying.