@delirious_owl well, even on nice, flat, straight segregated cycling line, most people don't go 30kph. Not even 25, i can see it easily here because it's the max speed authorized legally around and not many people pass electric bikes.
Admittedly, I'm late most of time and ride around 30kph to make up for it, but the huge majority of people? They're like 15-20 kph max, really. And it's more than enough to go around the city 🤷♂️