https://www.flatironcorp.com/project/carquinez-suspension-bridge ,
https://www.youtube.com/watch?v=4_QJ2a8eI-M
https://en.wikipedia.org/wiki/Carquinez_Bridge ,
https://www.youtube.com/watch?v=5cdG0oXuRto
http://www.opacengineers.com/features/carquinez
sf ba bridges
