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They need to be brick shaped so that they fit in the smallest space possible when required to do so. If the cab was shaped like a bullet train that would be a waste of space.
https://limitlane.com/wp-content/uploads/2021/05/164140.gif
Why aren’t HGV’s more aerodynamic? I’ve often wondered why the cost/impact of pushing a frontal area the size and shape of a vertical snooker table isn’t mitigated.