You don't need slower cars. Just efficient at X, Y, Z average speeds.
Cars are mostly getting bigger due to safety regulations though. The interiors are smaller than ever but the exteriors get bigger and bigger. The gap is being filled with crumple zones and airbags.
Cars slower: Not Good
You don't need slower cars. Just efficient at X, Y, Z average speeds.
Cars are mostly getting bigger due to safety regulations though. The interiors are smaller than ever but the exteriors get bigger and bigger. The gap is being filled with crumple zones and airbags.