Heard of “road diets?” Here’s why fewer lanes can actually be faster—and safer.

Ford pumped out a lot of cars in the early 1900s, and by the '60s there were so many vehicles on US roads that traffic engineers decided to add more lanes. Unfortunately, they were a bit overzealous, and many roads were expanded even when there was really no need. That left the country with a lot of overbuilt and unsafe roads that persist to this day.

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