> 300 kg of cargo at 25 km/h is very close to the momentum of a moped riding at 50 km/h, which is something I definitely don't want to share a bike path with.

> 300 kg of cargo at 25 km/h is very close to the momentum of a moped riding at 50 km/h, which is something I definitely don't want to share a bike path with. Why does the mass or momentum of a particular vehicle driver combination matter in terms of sharing a particular resource? Drivers of motor vehicles like cars share the road with other motor vehicles that are significantly more massive, yet no one says that they shouldn't have to share the road with those heavier vehicles because of their mass and/or momentum.