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. 2024 Mar 29;11:325. doi: 10.1038/s41597-024-03149-8

Table 4.

Capacity (veh/h/lane) and free flow speed (km/h) of roads.

No. City Capacity Free Flow Speed
Expressway Highway Local Roads Expressways Highway Local Roads
1 San Francisco 2,200 2,000 1,400 90 60 40
2 Seattle 2,200 2,000 1,400 90 65 45
3 Portland 2,200 2,000 1,400 90 65 45
4 Las Vegas 2,200 2,000 1,400 90 60 40
5 Chicago 2,000 1,900 1,400 90 60 40
6 New Orleans 2,200 2,000 1,400 90 60 40
7 Austin 2,200 2,000 1,400 90 65 40
8 Minneapolis 2,200 2,000 1,300 90 65 40
9 Dallas 2,200 2,000 1,400 90 65 45
10 Milwaukee 2,200 2,000 1,400 90 65 45
11 New York City 2,200 2,000 1,400 90 60 40
12 Washington 1,800 1,500 600 60 40 25
13 Boston 2,200 2,000 1,300 60 45 30
14 Philadelphia 2,000 1,800 1,200 90 60 30
15 Pittsburgh 2,200 2,000 1,200 90 60 30
16 Miami 1,800 1,500 900 65 50 35
17 Atlanta 2,200 2,000 1,400 70 50 35
18 Phoenix 2,200 2,000 1,500 90 65 45
19 Denver 2,000 1,800 1,300 90 60 35
20 Honolulu 2,200 2,000 1,400 90 60 40