月度归档： 2026 年 8 月

“Only 5% of Congestion Is Caused by Poor Signal Timing” — Is This 20-Year-Old Figure Still Valid?

作者 PengF

“Only 5% of Congestion Is Caused by Poor Signal Timing” — Is This 20-Year-Old Figure Still Valid?无评论

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In 2004, the U.S. Federal Highway Administration (FHWA) estimated that only about 5% of traffic congestion was caused by poor signal timing. That figure was widely cited for years, but more than two decades later, FHWA has not published a new national…