The Greatest Bridges Ever Constructed

 https://www.youtube.com/watch?v=FDuvDi7LYhY

The $1BN Race to Save The Golden Gate Bridge https://www.youtube.com/watch?v=QcV1btTEAVg

A Barrier_transfer_machine has made the bridge safer.

https://www.cnbc.com/2018/02/08/the-road-zipper-eliminated-head-on-collisions-on-golden-gate-bridge.html

https://www.goldengate.org/bridge/bridge-operations/traffic-management/

https://mtc.ca.gov/whats-happening/news/special-features/golden-gate-bridge-moveable-median-barrier

https://www.kqed.org/news/11594879/the-mesmerizing-machine-that-makes-driving-across-the-golden-gate-bridge-less-terrifying

https://en.wikipedia.org/wiki/Barrier_transfer_machine#Permanent_locations