Absolutely, bike lanes in Germany are an afterthought _at best_. I see bike lanes here springing into existence randomly with no way to get on (you're on the street with the cars, and suddenly you see a bike lane on the other side) and, similarly, ending with no reasonable way to continue (just hop off the sidewalk here please!). In my neigborhood, "red" means bike lane 50% of the time and sidewalk the other 50%. There is literally a sidewalk close by where the lane colors switch half way through. They're also often poorly paved with big bumps to get on and off at intersections.
Being born and raised in the Netherlands, this was a bit of a nasty surprise when I moved here. I really think you can cut down car use significantly by improving the infrastructure. The distances and landscape lend themselves well to biking, but the roads do not.
Yeah times 1.6 isn't too hard right? Just add 50% and 10% in succession, very easy to do in your head.
The other way around is trickier. I tend to divide by 8 (or /2/2/2) and multiply by 5, which is harder but still consists only of steps that are clearly defined in my head.
Being born and raised in the Netherlands, this was a bit of a nasty surprise when I moved here. I really think you can cut down car use significantly by improving the infrastructure. The distances and landscape lend themselves well to biking, but the roads do not.