My take:
<subheading>Transit improves traffic</subheading>
When many people travel on the road as a unit - in a bus for example - traffic flow improves compared to everyone driving their own car and thus travelling as separate units of traffic. Most of the bad stuff we dislike about traffic results from "friction" and interaction: yielding at intersections, the gaps between vehicles following each other, being slow to react on green light, and so on.
But traffic won't automatically improve with more transit. It needs to be planned such that ...
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In your long version (which you admit can be improved) I dislike the fancy, prestige words of "residents", "destination", "greater number or proportion of people" can just be "more people". I find that good, world-renowned experts are not afraid to write in simple words but still give deep insights into special topics. I find that the less pretentious and shorter the words are in an academic paper, the more likely it is to come from a top research group or top researcher.