Also worth mentioning in addition to the other points: A highway is built to much higher standards than the Main Street of your town, which is built to a higher standard than a back country road, which is built to a higher standard than your neighborhood road, all precisely because of the amount of traffic they’re expected to handle.
A highway needs to be built to handle thousands of cars and trucks going 70mph (112km/h) per day, whereas a neighborhood road only needs to be built to handle one family crossover going 15mph (24km/h) every half hour or so.
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