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21 · Cermak

Total headways: 10,235

Bunching rate

1.2%

Share of observed headways considered bunched

Excess wait (min)

+8.8 min

Extra wait vs. schedule (frequent service only)

Headway CV

0.63

Spacing irregularity — 0 is perfectly even

Median scheduled headway

9.46

Typical planned spacing between buses on this route

Median actual headway

22.40

Typical spacing between buses on this route

Segment ranking

Worst segments

SegmentBunching rateHeadways
From Cermak & Canal
To Cermak & Archer
7.4%95
From Cermak & Halsted
To Cermak & Union
6.4%94
From Cermak & Archer
To Cermak & Wentworth (Red Line)
6.4%94
From Cermak & Lumber
To Cermak & Canal
6.3%95
From Cermak-McCormick Place Green Line Station
To Cermak & Indiana
6.3%96
From Cermak & Wentworth (Red Line)
To Cermak & Clark
5.3%94
From Cermak & Morgan
To Cermak & Halsted
5.3%94
From Cermak & Clark
To Cermak-McCormick Place Green Line Station
5.3%95

Spatial view

Route segments

AM peak
Low (<10%)
Medium (10% - 20%)
High (20%+)
No data

Trend by hour

Route 21 · bunching by hour

Peak risk: 4p (2.4%)
0%3%5%8%10%12a: 0.0%12a0.0%1a: 0.0%1a0.0%2a: 0.0%2a0.0%3a: 0.0%3a0.0%4a: no data4a5a: 0.0%5a0.0%6a: 0.2%6a0.2%7a: 2.1%7a2.1%8a: 0.3%8a0.3%9a: 0.0%9a0.0%10a: 0.1%10a0.1%11a: 0.5%11a0.5%12p: 0.0%12p0.0%1p: 1.0%1p1.0%2p: 1.1%2p1.1%3p: 1.7%3p1.7%4p: 2.4%4p2.4%5p: 1.5%5p1.5%6p: 0.4%6p0.4%7p: 1.6%7p1.6%8p: 0.0%8p0.0%9p: 0.0%9p0.0%10p: 0.1%10p0.1%11p: 0.0%11p0.0%