Germany also has much higher standards for the engineering of the actual roads themselves.
Like, they are designed to function 24x7x365 for years and decades on end, because they have a much deeper and thicker roadbed, and much better irrigation and runoff control.
Part of this is because the road maintenance costs are built into the initial build cost, and any further maintenance in the future has to be done for free, at the cost of the road builder. And to the standards required by law. Since no road builder wants to ever have to pay for any future repairs, they seriously engineer the heck out of the roads to begin with.
Here in the US, repairs to roads are a profit center. So, of course road builders are going to make them as cheap and cheesy as possible, so that they can cash in on all that great guaranteed future income from all the repairs they're going to have to make in the next few weeks, months, and years.