Bandit_the_Kitty
TIL the British had a secret WW2 plan called Operation Tracer to leave behind an observation post if the Germans captured Gibraltar. Six men were to be sealed inside a hidden chamber to observer the harbor and Strait of Gibraltar. They would have had 7 years of supplies and bicycle-powered radios.
en.wikipedia.orgSubmitted by Bandit_the_Kitty t3_y25jre in todayilearned
Bandit_the_Kitty t1_iu140no wrote
Reply to What happens if cars are already on the Liberty Bridge at 2 or 6pm when the lanes change? Or is there a system to make sure that never happens? by rabid_braindeer
https://en.wikipedia.org/wiki/Barrier_transfer_machine?wprov=sfla1
This is how they do it on the golden gate bridge. Basically close the lane in one direction and open in the other at the same time.