HEIGHT
Why do the lower classes need higher vehicles than the upper classes? The rich do not want double decker cars, or ones as long or as wide as buses, they seem to be happy with Rolls Royces. There are no essential loads which are larger than a family sized car. Lorry size relates to driver economy, not the size of furniture or packages. See VEHICLE HEIGHT Chapter No 6. I believe we do not require 100% penetration for 16'-6" high vehicles. 20% of people today live in flats which have lifts separating their personal front door from their parked cars, furniture vans, dustcarts and ambulances, so there need be no lowering of standards. Because in practice I think only 20% of road frontage would be denied access to high vehicles, with a further 30% which would require high vehicles to journey an extra mile per journey.