Some combination of both would be best in my opinion. Weight due to wear on roads and size due to the safety implications (some personal vehicles are now almost 2m tall and impossible to see over for pedestrians and cyclists - creating a much more dangerous environment).
https://en.wikipedia.org/wiki/Fourth_power_law
Also, squishy humans really prefer to not be hit by heavier objects travelling at similar speeds.
https://pavementinteractive.org/reference-desk/design/design...
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