why does adding more traffic lanes doesn’t help to alleviate traffic congestion?
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More lanes actually *do* help relieve congestion for a fixed amount of traffic, otherwise we’d save money by just building two lane roads everywhere. There are two primary issues that work against this. First, build better roads and more people will drive. But the second issue is worse – you have to get traffic on and off your big road. Typically, that only happens on the far right lane, sometimes the far left lane. Sometimes a couple of those lanes. People have to get to that one side to get off, and usually people get on on that same side. This causes congestion as the traffic mixes.
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