If we have all that money to send to Africa to ‘fight’ AIDS, we have plenty of money to not fix bridges but just build new ones, in pairs, in case one fails.
Just as it is more expensive per sf to put an addition on a home than it is to build one from scratch, you would think it would be less expensive to build a new bridge than to attempt to rebuild an old one.
It should be easier, cheaper, and faster to design and build a new one where you don’t have to worry about scheduling around existing traffic.