By the way, in the meantime I have contacted the concrete supplier because I wanted to know where the problem was with the first and second attempts. The response was very kind and above all detailed. Nowadays not normal, in my opinion, as no one takes time for the customer anymore. I also praised this accordingly.
The fact is that it turned out that neither the driveway nor a defective pump was the problem, but the traffic regulation order was missing. In other words, a road closure! If the pump is on the access road, the mixer has to drive up front. This always results in a total length of 20m. That means it would block the pedestrian and bicycle path as well as half of the street. Even on the second attempt, the traffic regulation order was missing although it had been assured by the construction company in advance. Very interesting. Apparently, this is always the case in the construction industry because the margin is no longer that high and thus an attempt is made to pass such costs on to the customer. I think it often works too. But not with me!
That is why I had to apply for a road closure after the second attempt. I was already wondering what that was about because the construction manager had noted in writing during the inspection beforehand that none was necessary.
It remains exciting...