I just looked out the window of our office and took a quick sample of the traffic. There's no bus route on our road, mind. Out of 10 vehicles, 2 looked private (no livery at least - one Mercedes S-class possibly chauffeured, the other could be Uber but wasn't a Prius so maybe not), 3 were black cabs, 3 were delivery vans and 2 were trade vans.

Eliminate 70% of that traffic, and something will break. Kill taxis and business will suffer. Kill trade vans and basic utilities will be out of action for longer. Kill deliveries and the pace of economic activity will slow down. Deliveries are the best candidate for reduction, but don't forget use of delivery vans is directly related to public transport use - people who use public transport can't carry lots of stuff around, or trek out to centralized pickup hubs, so they need delivery vans instead.