> (car weight + grocery weight)^2 That's ^4 actually. Friction / Normal Force / Damage to roads is to the Fourth power law. Yeah, the 100x lighter cars might

> (car weight + grocery weight)^2 That's ^4 actually. Friction / Normal Force / Damage to roads is to the Fourth power law. Yeah, the 100x lighter cars might actually be better in practice. That's what makes this last-mile problem so problematic. We're already (possibly) at the local optimum.