A portion of the old bridge's upper level collapsed onto the lower level during the 1989 earthquake. It killed one person. The old bridge had piles driven into soft mud which made it sway several feet in opposite directions due to its proximity to the fault line. Because it wasnt a suspension bridge it flexed more and the bridge wasnt engineered to "give" thst much and as the bridge expanded and contracted it expanded just a bit too far on one span causing the upper level to collapse. The new bridge is a suspension bridge which is much more forgiving when it comes to flexing and stretching. It uses one single cable that is completely connected to loop underneath the road ans then back over the tower ans underneath the other side. Its almost like a hanging basket. The tower is buily into bedrock. The rest od the bridge that is almost a causeway style, had an innovative foundation that is used in sea based oil drilling rigs.
They wanted to make the bridge more earthquake-proof and if an earthquake happened the old bridge can possibly damage the new one so they decided to remove it long story short you're welcome
You can walk on the new bridge, but you could not walk on the old bridge because it was too narrow, and at the same time that other bridge had expired and at any moment something bad could happen, now it is fine and the safety of pedestrians and cars is guaranteed. Thanks to all the officials
To finish the rest of the job. New bridge.
Supposedly the other was already about to collapse 🤔
1989 during the earth quake part of the bridge fell. Probably a good reason to rise/keep tolls wich are really expensive
Thanks! Your answer is awaiting moderation.