Imagine for a minute that you need to do some roadwork.
And imagine further to this roadwork is relatively extensive, and required cutting off access to the top half of a one way road.
Something like this for arguments sake, snapped recently in Bath, MA.
Obiviously you can’t have cars turning left, and driving up the one way street, as you would have a pile of cars in front of your building site.
The obvious answer to this problem of course it to remove a bolt. Like this. Genius.