4 ms·
Narrows was almost a century ago, and taught bridge builders to consider airflow. The more recent I-5 bridge collapse was because a truck was too tall and colli
by stephengillie 8y ago
Narrows was almost a century ago, and taught bridge builders to consider airflow. The more recent I-5 bridge collapse was because a truck was too tall and collided with bridge supports.
- dboreham 8y agoOr perhaps: because designers failed to take into account the possibility that someone would drive a too tall trck over the bridge?
- theandrewbailey 8y agoI'm not a bridge engineer, but I'm pretty sure that height requirements are there for a reason. In fact, I looked at this incident last week, and it seemed that there was a different maximum height depending on which lane you were in, but that was ignored/not acted on. https://en.wikipedia.org/wiki/I-5_Skagit_River_Bridge_collapse https://en.wikipedia.org/wiki/I-5_Skagit_River_Bridge_collap... The vertical clearance from the roadway to the upper arched beam in the outer lane is 14 feet 7 inches (4.45 m), and all trucks with oversize loads are expected to travel in the inside lane where the clearance is around 17 feet (5.2 m). The oversize truck instead entered the bridge in the outer lane, while a second semi-truck and a BMW were passing it in the inner lane. ... A pilot car was hired to ensure the load could pass safely. The pilot car never signalled the truck driver that there would be a problem crossing the Skagit bridge and did not warn the trucker to use an inside lane.