How is it safe to ride 20 mph right next to pedestrians and their kids and dogs, separated by just different colored pavement?
This design and many others seem to assume we all ride slowly and sedately.
In the U.S. we seem to think it's safe to drive 30-50 mph right next to pedestrians without even any color separation.
Most people in NL average about 13 mph (prob 11 - 16 range). If you need or want to go faster you almost always can. When I've been in a hurry there've only been a few times when I needed to slow.
From a time from A to B standpoint a bicycle nearly always beats a car. This is largely due to a bicycle network not needing stop lights or signs (except where crossing cars) since bicycle riders can negotiate with each other, so less junction delay. Bicycle riders take up less space so can pass each other far more easily than cars (a 10' lane (cycletrack or motor lane) can handle about 15-20 times as many bicycle riders as cars). Cycletracks and paths function like multi-lane interstates or motorways (except bicycle riders do stay right except to pass, unlike in the U.S.).
Cycletracks can go where roads cannot providing for shorter routes such as through construction areas or being two-way where motor traffic is one-way or being allowed to make turns where motor traffic is prohibited.