If a city has an index of 1.5, it means a 20-minute trip in light traffic takes 30 minutes during rush hour (a 50% increase).

Historically, cities like top the index. In these hubs, the rush hour index often suggests that drivers lose over 100 hours a year just sitting in peak-period traffic. 2. Digital Archives: The "Index Of" Search Syntax

05:30–07:00 — Low single digits. Streets are waking; transit runs ahead of the surge. 07:00–09:00 — Rapid climb into the 50s and 60s as offices open; major corridors hit 75 locally. 09:00–11:00 — Partial recovery into the 30s; late commuters keep variability high. 16:00–18:30 — Second spike, often sharper — evening social patterns and freight overlap, pushing index peaks higher than mornings on some routes. 19:00 onward — Gradual descent back toward single digits.

Just let me know your actual goal, and I’ll produce the paper accordingly.