Because it’s a slightly different argument. “More people will use the highway” is not really applicable here. The bus analogy also didn’t meant “more people will take a bus”, just that if you have bus route where 20 people on each bus stop need to wait for the next bus, if you increase capacity of buses by 10, then only 10 people will be waiting on bus stops, but you will still have 100% bus utilization.
In other words, with added lane on highways, it’s sociological mechanism, which is slightly less precise analogy.
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Because it’s a slightly different argument. “More people will use the highway” is not really applicable here. The bus analogy also didn’t meant “more people will take a bus”, just that if you have bus route where 20 people on each bus stop need to wait for the next bus, if you increase capacity of buses by 10, then only 10 people will be waiting on bus stops, but you will still have 100% bus utilization.
In other words, with added lane on highways, it’s sociological mechanism, which is slightly less precise analogy.