[sempron64]

Most parents are not physically capable of operating such a contraption regularly. I would hate my life if I needed to lug my kids in that contraption when I want to take them to the park, doctor, grocery store, or any life activities. In a bike lane with e-bikes and racing bikes overtaking me constantly

Hmm, maybe it would help if I added an electric motor. But my kids are still at risk of injury if I’m hit by irresponsible cyclist, it will be a horrible tangle of metal and limbs. So maybe we should be in some kind of enclosure…

[sudosysgen]

The idea is that in such a city you don't need to lug around your children unlesd they're quite young. Children as young as 8 are fully capable of going to school, park, etc... on their own.

With some physical aptitude you can easily go 25-30km/h on a bog standard Walmart bike. On my unrestricted ebike I never pass 32 on a bike lane (if I'm going faster I just go into a car lane). So an ebike limited at 32 is no more or less dangerous than a normal bike. No need to build a car.

Anyways cyclist on cyclist injuries are much less severe in general than car on car.

[manwe150]

In terms of traffic flow, I notice that there is a big difference in how terrain affects manual vs powered bikes. I am an avid cyclist, so I say this just to point out that humans tend to be power-limited, while machines tend to be speed-limited. I’ve observed, when my friend and I are out together, that we need to keep more space between us if we are on different modes of power, to account for the abrupt changes is our relative speeds when the terrain shifts abruptly.

Is the injury stat a guess or a fact? I wouldn’t have intuitively been willing to hazard a guess either way myself.

[eynsham]

And when everyone adds enclosures i.e. ends up in a car, you’re at much more risk than you were before and have all the harms of car-centric urban planning.

The physical ability of people is historically specific and if people were to generally cycle most would be able to ‘operat[e] such a contraption’.

It is possible to regulate cycle lanes so that people don’t just zoom around irresponsibly. Curiously you don’t seem to consider equivalent risks from cars (can’t drivers act irresponsibly? is it preferable that they have several orders of magnitude more mass with which to injure people?)