Width of the access route in Hamburg concerning the fire department?

There are 6 single-family houses in the back.

Then just talk to the locally responsible fire inspector, in my experience it has been very straightforward and unbureaucratic. The question is always, do they want to drive the entire fire engine right up to the house, or is a hose line from the street enough for them and if necessary they will come running with "an extension ladder" (quote from the fire inspector here). PS: How do you handle garbage collection and snow removal?

Therefore, the 3.50m.... stupid.

PS: How do you handle trash collection and snow removal?

That still needs to be clarified.
But it concerns me less, since I am at the front.