Critics say duck boats are too dangerous for city streets
![Critics say duck boats are too dangerous for city streets](http://bloximages.chicago2.vip.townnews.com/tdn.com/content/tncms/assets/v3/editorial/c/a4/ca442bd6-ebbc-5cda-9cf0-4244de701fee/560561dc26cfb.image.jpg?resize=300%2C200)
SEATTLE (AP) — The National Transportation Safety Board's investigation into the deadly crash of a duck boat and charter bus is the first time the agency has looked into a land crash of the am…