I mean theoretically adding a lane or two should allow more cars to flow through, or would bad drivers still cause bottlenecks/gridlock despite the added capacity?
In: 28
Neither:
Drivers are individuals who each have a comfort level with the amount of traffic they are willing to drive in, and they also have requirements for when they need to arrive. As a whole they balance these two factors and totaled together across a metropolitan area you get the amount of traffic you see at rush hour.
If you widen a road (taking up space that is currently business or homes) the equation updates and more drivers leave earlier and you still have the same amount of congestion at rush hour in addition to more pavement to maintain using more tax money and longer trips because you had to move homes and businesses out of the way.
You run out of reasonably taxable income to maintain the widened roads before you can widen roads enough to have no congestion.
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