New Civil Engineer has published more details about how the temporary double decker bridge will be installed while Hammersmith Bridge is repaired.
You can read the full article at: https://www.newcivilengineer.com/latest/engineering-plan-behind-hammersmith-bridges-double-decker-solution-07-04-2021/
The key points are:
I think it's a shame that they feel the need to allow cars to cross on the upper deck. If they just left it open to walkers and people on bikes, while using the lower deck to fix the bridge, everyone would be happy. Well, everyone except the people who want to drive their cars into the already congested streets of London, that is.
Posted on 7th April 2021