Where two agencies almost meet

A spatial scan for stops run by different agencies that sit within a short walk of each other (400 m). Each such pair is a place where a rider could transfer — so the schedules ought to line up. We rank them by how close the stops are and how far apart the two services' frequencies run, surfacing the pairs where a merge or a timetable alignment would help riders most.

3,238

Cross-agency stop pairs

within 400 m of each other

400 m

Walkable transfer radius

great-circle (ST_Distance_Sphere)

~30 min

Worst typical transfer wait

½ the slower service's headway

Ranked coordination candidates

Top 40 of 3,238 cross-agency stop pairs within400 m, ranked by a closeness + frequency-mismatch score
#	Stop A	Stop B	Apart	Transfer wait	Score
1	115th Street Metra StationCTA · bus/rail · ~10 min	KensingtonMetra · commuter rail · ~60 min	12 m	~30 min	0.98
2	Ashland & CortlandCTA · bus/rail · ~10 min	ClybournMetra · commuter rail · ~60 min	13 m	~30 min	0.98
3	Cottage Grove & 112th StreetCTA · bus/rail · ~10 min	111th St. (Pullman)Metra · commuter rail · ~60 min	21 m	~30 min	0.97
4	Western-CermakCTA · bus/rail · ~10 min	Western AvenueMetra · commuter rail · ~60 min	23 m	~30 min	0.97
5	Cottage Grove & 104th StreetCTA · bus/rail · ~10 min	103rd St. (Rosemoor)Metra · commuter rail · ~60 min	23 m	~30 min	0.97
6	Western-CermakCTA · bus/rail · ~10 min	Western AvenueMetra · commuter rail · ~60 min	23 m	~30 min	0.97
7	Lake Park & 47th StreetCTA · bus/rail · ~10 min	47th St. (Kenwood)Metra · commuter rail · ~60 min	23 m	~30 min	0.97
8	Cottage Grove & 109th StreetCTA · bus/rail · ~10 min	107th St.Metra · commuter rail · ~60 min	25 m	~30 min	0.97
9	Cottage Grove & 108th StreetCTA · bus/rail · ~10 min	107th St.Metra · commuter rail · ~60 min	25 m	~30 min	0.97
10	Cottage Grove & 105th StreetCTA · bus/rail · ~10 min	103rd St. (Rosemoor)Metra · commuter rail · ~60 min	25 m	~30 min	0.97
11	E Hyde Park & CornellCTA · bus/rail · ~10 min	51st/53rd St. (Hyde Park)Metra · commuter rail · ~60 min	28 m	~30 min	0.96
12	Lake Park & 47th Street TerminalCTA · bus/rail · ~10 min	47th St. (Kenwood)Metra · commuter rail · ~60 min	28 m	~30 min	0.96
13	Wacker (Upper) & StetsonCTA · bus/rail · ~10 min	Millennium StationMetra · commuter rail · ~60 min	29 m	~30 min	0.96
14	Cottage Grove & 113th StreetCTA · bus/rail · ~10 min	111th St. (Pullman)Metra · commuter rail · ~60 min	33 m	~30 min	0.96
15	Halsted & RooseveltCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	33 m	~30 min	0.96
16	Ashland & North AveCTA · bus/rail · ~10 min	ClybournMetra · commuter rail · ~60 min	36 m	~30 min	0.95
17	Ravenswood (west Leg) & LelandCTA · bus/rail · ~10 min	RavenswoodMetra · commuter rail · ~60 min	37 m	~30 min	0.95
18	Ashland & ElstonCTA · bus/rail · ~10 min	ClybournMetra · commuter rail · ~60 min	39 m	~30 min	0.95
19	Halsted & 14th PlaceCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	40 m	~30 min	0.95
20	Halsted & MaxwellCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	40 m	~30 min	0.95
21	Cicero-CermakCTA · bus/rail · ~10 min	CiceroMetra · commuter rail · ~60 min	41 m	~30 min	0.95
22	Cicero-CermakCTA · bus/rail · ~10 min	CiceroMetra · commuter rail · ~60 min	41 m	~30 min	0.95
23	Stony Island & 57th StreetCTA · bus/rail · ~10 min	51st/53rd St. (Hyde Park)Metra · commuter rail · ~60 min	45 m	~30 min	0.94
24	Halsted & TaylorCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	45 m	~30 min	0.94
25	Ashland & FullertonCTA · bus/rail · ~10 min	ClybournMetra · commuter rail · ~60 min	47 m	~30 min	0.94
26	Balbo & ColumbusCTA · bus/rail · ~10 min	Museum Campus/11th St.Metra · commuter rail · ~60 min	48 m	~30 min	0.94
27	60th Street & Stony IslandCTA · bus/rail · ~10 min	55th - 56th - 57th St.Metra · commuter rail · ~60 min	50 m	~30 min	0.94
28	Halsted & 16th StreetCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	50 m	~30 min	0.94
29	MainCTA · bus/rail · ~10 min	Main St.Metra · commuter rail · ~60 min	51 m	~30 min	0.94
30	MainCTA · bus/rail · ~10 min	Main St.Metra · commuter rail · ~60 min	51 m	~30 min	0.94
31	Halsted & PolkCTA · bus/rail · ~10 min	Halsted StreetMetra · commuter rail · ~60 min	53 m	~30 min	0.93
32	Stony Island & 57th DriveCTA · bus/rail · ~10 min	51st/53rd St. (Hyde Park)Metra · commuter rail · ~60 min	53 m	~30 min	0.93
33	LaSalle/Van BurenCTA · bus/rail · ~10 min	LaSalle StreetMetra · commuter rail · ~60 min	54 m	~30 min	0.93
34	LaSalle/Van BurenCTA · bus/rail · ~10 min	LaSalle StreetMetra · commuter rail · ~60 min	54 m	~30 min	0.93
35	Irving Park-BlueCTA · bus/rail · ~10 min	Irving ParkMetra · commuter rail · ~60 min	55 m	~30 min	0.93
36	LaSalleCTA · bus/rail · ~10 min	LaSalle StreetMetra · commuter rail · ~60 min	56 m	~30 min	0.93
37	Wacker (Upper) & StetsonCTA · bus/rail · ~10 min	Van Buren St.Metra · commuter rail · ~60 min	57 m	~30 min	0.93
38	Congress Plaza & MichiganCTA · bus/rail · ~10 min	Van Buren St.Metra · commuter rail · ~60 min	57 m	~30 min	0.93
39	King Drive & 25th StreetCTA · bus/rail · ~10 min	18th St.Metra · commuter rail · ~60 min	57 m	~30 min	0.93
40	Clinton-BlueCTA · bus/rail · ~10 min	Chicago OTCMetra · commuter rail · ~60 min	57 m	~30 min	0.93

Source: Agency GTFS static (stop geometry) + published agency schedules (headways) — spatial join within 400 m (ST_Distance_Sphere); headways are representative, not real-time · as of 2026-07-02

Headways used

The timing gap uses one representative published headway per agency. These are typical, not real-time — a live GTFS-realtime feed would sharpen them.

Representative published headway per agency
Agency	Headway	Basis
CTA	~10 min	CTA rail + core bus (representative peak)
Pace	~30 min	Pace suburban bus (representative)
Metra	~60 min	Metra commuter rail (representative off-peak)

Receipts: docs/architecture/DATA_SOURCES.md. Stop geometry from each agency's GTFS static feed; distances are great-circle metres.