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Yeah, on urban roads the number of vehicles that can get through on each green cycle is the limiting factor on capacity, which is why roads typically fan out to as many lanes as possible at each set of lights.
And why complaints about reducing the number of lanes on a road away from junctions are usually bollocks or grossly exaggerated.
grams
Am I right I’m thinking that the real limit to how fast cars can move on a route is how fast they flow through the tightest constriction which is usually a junction with two lanes one left turn and one right/straight ahead. So you can have cars using the main lane and the bus lane but when you all get to the junction it’s no faster on average, it’s only faster for the cocks who have used the bus lane to weave through traffic.