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It is standard highway design to include a natural curve every 3–5 kilometers, so why do U.S. highways so often look straight enough to reach heaven?

View original Chinese title

每隔 3~5 公里设置自然弯道是高速公路设计的常识，但是为啥我们经常看到美国国家公路直得像到天堂一样？

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Ranking history & source details

First recorded Aug 23, 2026, 9:27 PM CST · latest Aug 26, 2026, 8:52 AM CST. Ranks reflect attention on each platform.

Retained daily observations
DayPlatformBest rankLast rank
2026-08-26Zhihu Hot List#27#27
2026-08-23Zhihu Hot List#10#10
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