Why Don’t Buses Have More Axles?

I was in yet another discussion on Friday where the topic arose that buses do more damage to our streets than any other vehicle, because their full weight falls on just four contact points.

Which has me wondering, what keeps bus manufacturers from putting more axles on a bus, like a semi-trailer? Would it have some adverse affect on the performance of the vehicle? Are there impacts on passengers? Turning radius? Or is this an untapped market opportunity?

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