I can sort of see a wee bit of merit in a ban like this, but not much.
As an ex-line mechanic who has installed and repaired hundreds of streetlight poles, it worries me that authorities seem to make their own rules these days, I bet no-one bothered to ask anyone "in the field" about the posts.
There are a lot of people in this world that are sick and tired of all of the constant "safety" warnings tendered these days and to a certain degree, they make everyone feel like children.
Why don't they just go for one blanket warning to cover it all:

Warning: We may deem you too stupid to effectively contribute to society, please ensure that you remain indoors at all times and never leave the safety of your home.
You can still pay your taxes on-line.

If this was affixed to the inside of every front door the world over, imagine the nice safe world we would live in.

GRRRRR. [Linked Image]