Justify building application - 40m extension zone at the highway

Regarding the garage: Would it be conceivable to commit oneself to dismantle the garage again at one's own expense in a timely manner, should it be necessary for a highway expansion or similar, for example? Can the garage be built in such a way that the tree stock is not disturbed? Have you already had the opportunity to ask the neighbor to the north?

Regarding the garage: Would it be conceivable to commit oneself to dismantling the garage at one's own expense in a timely manner should it be required, for example, for a highway expansion or something similar?
Can the garage be built in such a way that the tree population is not disturbed?

Those are exactly my thoughts on the matter. The tree population on "my" property is zero. The trees are located on the earth embankment up to the highway and have grown on the highway’s land.
Especially with a garage, I see the "demolition requirement" as unproblematic for me personally, since I only want a "cheap garage" anyway. A simple metal shed where my car is protected is sufficient (although it is supposed to be 9x9m in size and have a certain height).
Ideally, the garage is a kit that could be rebuilt elsewhere if necessary.

Have you already had the chance to ask the neighbor to the north?

Unfortunately not yet, however, after reviewing the 30-year-old documents related to the granting of his garage’s building permit, the northern neighbor was not within the 40m zone at the time. Only today has the zone moved closer to him, and thus the garage is now partly within the zone.

But I have another neighbor who recently built a triple garage directly next to the noise barrier; I will get in touch with him when I am back on site.

PS: I have an appointment tomorrow with a lawyer specializing in public construction law. I hope he can assist me with wording and advice.

My father-in-law rummaged through the old documents from 30 years ago and fortunately found the building permit from back then.

It is probably past its expiration date

I think you can't get any further here without consulting a lawyer. As several people have already pointed out here, they know the correct terminology.

He can handle form and deadline, which is more crucial in this case.

It is probably past its expiration date

Yes, definitely! But a few interesting aspects emerge from it that could possibly be used as arguments today. In addition, there is correspondence with the building authority about a plot of land that was given up for development about 25 years ago.
I will report back here in any case

Hello everyone,

I would like to get back in touch now, because today the special permit from StraßenNRW arrived. The house may be built as planned, even though a few square meters lie within the restricted zone, and the garage may also be built, with the condition that it must be demolished if necessary. The exception actually applies only to me (or us) personally.

Let's see what the building authority has to say about my preliminary building inquiry.