Once every quarter, the Market Street Bridge is shut down for maintenance and testing. This is the first time I have remembered to go watch it. They spend quite a bit of time climbing all over it. Two workers climbed up on the very top and then the bridge opened just a tad. Then one of those workers climbed down into the opening between the two halves of the bridge. That is not a job that I would like! You can see him in the photo below.