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CTA logo June Average Weekday Bus Ridership By Route

Average CTA bus ridership data is available for May 1998 through June 2018.

View CTA's Published Monthly Ridership Reports

  
  
CTA Bus Summary
CTA Bus Aggregate Ridership

Click on a column header to sort the table by that column.

Route Service Type Trend 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998
1 Indiana/Hyde Park accessibleSupporttrned chart1,6731,6511,6811,9341,9052,3192,6822,8202,7862,8583,1143,2602,8172,8603,2856,9107,5776,5217,6537,1016,974
2 Hyde Park Express accessibleSupporttrned chart3,4853,2893,3373,3643,1553,0912,9492,7752,4342,3232,3302,1702,2982,2772,3181,0851,1359171,0001,0721,028
3 King Dr accessibleKeytrned chart16,25817,03017,62018,87718,57022,36422,24622,09922,15120,81921,25720,48921,83722,88123,73021,66322,52422,03122,06623,83821,013
4 Cottage Grove accessibleKeytrned chart19,10119,56620,08721,30620,04423,99723,98623,43023,39521,95723,06321,27623,01224,02923,45422,51523,11823,82023,31822,53822,439
5 South Shore Night Bus accessible Ridership for CTA bus routes 95E and N5 is tabulated togetherKeytrned chart437493498544465422729586552501519
6 Jackson Park Express accessibleKeytrned chart9,1579,6239,95910,98410,73112,23412,33811,28811,59711,96412,61311,89411,09711,3229,66217,34318,34316,41718,38118,04117,422
7 Harrison accessibleSupporttrned chart4,1824,3664,2875,0614,7945,8515,5516,2845,7905,9676,1865,7855,4975,1865,3025,1165,1385,2825,4845,4915,156
8 Halsted accessibleKeytrned chart17,80918,29518,87620,13719,51721,62121,10521,63719,89120,68520,96818,04918,01418,25818,48419,15519,44719,40719,39719,58618,569
8A South Halsted accessibleSupporttrned chart2,6362,7942,9453,2343,0235,2373,9294,0633,8513,6054,0523,5123,2853,0383,3113,5293,2983,1933,2753,4463,045
9 Ashland accessibleKeytrned chart17,04918,38118,26527,73626,24232,15630,94730,34229,42120,59423,00622,12927,66528,92229,26029,95730,87530,04130,47230,66229,568
X9 Ashland Express accessibleSupporttrned chart7,8677,7937,91010,89511,8209,3765,452
10 Museum of Science & Industry accessibleSupporttrned chart4446155566706158131,4291,2791,4111,4311,0849699431,286857644743677695358417
11 Lincoln accessibleSupporttrned chart1,4011,8891,7051,6771,5851,6225,5815,5925,2605,6186,3485,9593,2213,1753,1903,1963,4013,6123,8423,9894,061
12 Roosevelt accessibleKeytrned chart11,75212,76813,22813,70213,05714,71115,18614,68113,75813,52514,08911,25210,66611,16610,69910,22910,45210,59010,97910,6809,536
J14 Jeffery Jump accessible Service started mid November 2012Supporttrned chart10,90310,83711,29511,56711,77814,174
15 Jeffrey Local accessibleKeytrned chart7,0107,1247,2227,7097,0238,1947,9568,1477,8747,8647,8867,4697,6847,3858,785
18 16th/18th accessibleSupporttrned chart3,4223,6283,5183,3023,5153,6363,6213,3842,9561,8341,5141,4991,3511,4031,4151,6211,6281,4761,4121,5641,747
19 Stadium Express accessibleSpecialtrned chart195142783692752702543063444184279345033742232282223
20 Madison accessibleKeytrned chart16,02615,94417,03317,29717,99019,12519,82820,34521,86120,12521,27122,92423,50522,59621,50420,72023,73121,28720,82619,00818,478
21 Cermak accessibleKeytrned chart8,7679,3809,3409,8599,1479,14210,0779,8539,4029,4219,3778,0296,3616,6287,3838,1977,9538,0777,9177,1446,346
22 Clark accessibleKeytrned chart16,11116,17816,91418,67719,51521,33922,08922,40722,33423,51424,45621,92919,65519,85919,48521,34921,03821,81221,33021,94321,910
24 Wentworth accessibleSupporttrned chart2,4972,6332,6982,9142,8804,2443,3063,4173,0883,3023,5443,4593,2943,4614,0204,4994,2193,8434,2844,3363,919
26 South Shore Express accessibleSupporttrned chart4,3234,2913,3733,1493,1023,5863,1372,9662,6942,4892,5782,4202,3152,2891,943
28 Stony Island accessibleKeytrned chart6,0785,9586,4147,0936,8927,9284,9275,0645,3285,0345,6487,3768,9278,75610,04111,12913,01711,94712,14711,47511,421
29 State accessibleKeytrned chart11,11611,72512,44813,67513,22917,96915,41814,63014,12614,43415,68715,50015,48915,52414,86116,62317,74818,21417,53517,32717,524
30 South Chicago accessibleSupporttrned chart3,0372,9883,2923,5063,0033,0403,5513,4443,3633,2373,3583,3763,2973,3683,1083,3513,5753,5033,7093,4833,497
31 31st accessibleSupporttrned chart290290
34 South Michigan accessible Ridership for CTA bus routes 34 and 119 is tabulated together through year 2000.Keytrned chart4,7364,7034,8285,1904,7235,3376,1415,9045,8986,1375,6935,7565,5585,2976,1236,5896,9187,55012,68412,40212,545
35 35th accessibleKeytrned chart4,8645,0185,3675,3355,1344,7935,2265,1124,9415,1676,3706,3325,7695,6115,8785,5196,1966,2625,6195,3355,263
36 Broadway accessibleKeytrned chart11,78311,50312,44213,88313,90015,39616,04716,42916,45317,36117,16414,92415,04014,69514,21814,97715,35715,60015,34716,59716,248
37 Sedgwick accessibleSupporttrned chart1,3521,3571,4531,6471,5581,6231,8252,2202,4062,3682,2632,2352,3292,7382,673
39 Pershing accessibleKeytrned chart1,9271,8961,9622,0731,8551,7162,2672,1301,9931,9072,0001,7181,6461,7601,7601,7782,1042,2482,2942,3332,548
43 43rd accessibleSupporttrned chart1,4241,4621,6211,7751,6751,7101,9412,3582,1041,7311,7901,3081,3541,3351,2421,1561,2231,2491,2871,3691,532
44 Wallace/Racine accessibleSupporttrned chart3,1143,3233,3863,7423,5424,6854,4704,6754,7155,5256,3526,0466,2375,9125,9416,3465,8246,0786,0886,1515,799
47 47th accessibleKeytrned chart8,7479,7779,31810,4199,7579,67611,50411,53111,16711,31511,52511,60411,36011,73611,9868,2358,3778,2688,8018,6058,228
48 South Damen accessibleSupporttrned chart8118408531,1439571,2111,1371,1041,0809499909509471,0209891,0291,0108559919891,060
49 Western accessibleKeytrned chart15,84116,06316,61223,69623,40728,02128,48828,57627,60915,54720,62219,40418,38118,87421,00120,55823,00923,62323,37722,40125,655
49B North Western accessibleKeytrned chart5,1295,3885,4505,5075,3216,0705,8665,6655,4095,4805,4325,0214,8404,9455,1594,9605,0445,2094,3805,2175,261
X49 Western Express accessibleSupporttrned chart6,0446,1065,92515,25012,92911,58711,08011,2019,3108,2885,9255,8284,8855,190
50 Damen accessibleSupporttrned chart8,9979,0079,3889,5699,47510,37810,3119,7698,9718,6108,6527,9108,0577,5868,0207,8567,9578,4748,4208,3287,814
51 51st accessibleSupporttrned chart1,2681,3201,4181,4141,6431,5352,1652,0952,2382,2482,3662,2162,3712,4752,6104,5114,6654,3924,4884,4094,329
52 Kedzie/California accessibleSupporttrned chart11,83311,90712,07312,15011,85013,43613,63113,57713,30013,58013,08412,14611,37710,70011,12411,91811,81012,11212,34111,04110,415
52A South Kedzie accessibleKeytrned chart3,8714,0394,1244,4644,3084,9324,7814,8164,7694,5695,2135,0485,6506,6496,2456,6447,3716,4096,2956,2855,892
53 Pulaski accessibleKeytrned chart17,01517,88118,13920,09119,03321,26221,53821,58721,42521,17622,16720,72620,58922,95320,03220,15321,35620,46921,78121,33519,365
53A South Pulaski accessibleKeytrned chart6,9237,5347,8077,7827,0748,2478,3758,1697,8316,9057,8617,7838,2478,7418,8658,8758,7778,3998,5268,4088,139
54 Cicero accessibleKeytrned chart9,81510,47610,89711,52011,48311,90412,69712,58813,0828,8749,82712,29211,36111,58611,31211,18911,41712,75812,30511,07310,718
54A North Cicero/Skokie Blvd accessibleSupporttrned chart7857668158409259911,1451,0911,0229181,1481,2581,2261,1811,2401,2721,3331,3411,4031,2571,448
54B South Cicero accessibleKeytrned chart2,9283,2173,3043,5083,2593,6324,0694,1404,0473,6723,8293,6794,4014,6044,7654,8434,8354,9914,8904,9175,131
55 Garfield accessibleKeytrned chart9,42610,13610,81111,56910,92512,40513,36613,76713,5798,90712,10712,16613,70913,55012,72812,25712,72012,82512,75012,50811,780
55A 55th/Austin accessible Ridership for CTA bus routes 55N and 55A is tabulated together.Supporttrned chart314305310299292255288241221219239
55N 55th/Narragansett accessible Ridership for CTA bus routes 55N and 55A is tabulated together.Supporttrned chart535569586561540613689604665606596849779816868904877925871868921
56 Milwaukee accessibleSupporttrned chart8,1738,2018,5328,8739,49010,34810,59810,91611,40613,35014,46112,98913,39613,94813,02815,55915,51715,53815,04512,96014,880
57 Laramie accessibleSupporttrned chart2,3372,4572,4974,2214,4193,0692,9872,9943,0342,8153,1442,8522,7312,8643,0642,6553,0882,7822,6662,6252,572
59 59th/61st accessibleSupporttrned chart2,9953,1023,1544,0163,7853,1483,8823,6843,6593,5893,6333,5073,3833,4493,6623,8944,3223,9634,1684,2433,740
60 Blue Island/26th accessibleKeytrned chart9,4869,4949,4229,4749,51810,65010,94211,66211,91712,88513,67412,73112,74913,54314,55014,13513,88615,37714,24714,23014,242
62 Archer accessibleKeytrned chart9,58910,12910,66210,57810,05912,35611,52811,94411,81512,90415,32713,94313,38115,13314,73814,11914,55815,36713,79313,83514,220
62H Archer/Harlem accessibleSupporttrned chart9901,0521,0539238671,2671,3211,3601,3181,3601,4691,3031,1511,2051,3631,3491,4151,4171,4791,3971,334
63 63rd Street accessibleKeytrned chart14,66215,18915,70916,35816,75917,11819,85120,12019,86220,78522,68521,78819,97219,33420,61520,39621,67120,15421,20821,26720,209
63W West 63rd accessible Ridership for CTA bus routes 63W and 165 is tabulated together.Supporttrned chart1,4101,4391,3831,3901,3521,5161,7171,7411,7282,0162,1272,1042,1492,1712,2012,3342,1602,3252,1552,1802,154
65 Grand accessibleSupporttrned chart8,7268,6638,9158,8778,3619,2388,9698,7308,5757,7977,8326,8346,8606,9666,6806,6887,5217,1256,9736,3316,152
66 Chicago accessibleKeytrned chart22,16422,42722,76123,60623,74226,73227,53625,66924,52924,24225,46022,16221,01221,52820,70520,15023,03820,93220,89620,09920,419
67 67th/69th/71st accessibleKeytrned chart9,50810,68011,27812,07711,62111,77614,06214,05314,04913,17714,47913,73514,07213,79813,52013,80413,29213,55513,72713,78113,297
68 Northwest Hwy accessibleSupporttrned chart1,2741,3261,3791,2741,0601,5391,2481,2571,3071,4841,5831,6121,5861,4541,3071,4751,5811,4701,5761,5931,988
70 Division accessibleSupporttrned chart8,3018,4258,3439,3408,6369,6759,8489,81410,02910,17311,03710,74610,40710,52311,0169,91811,05810,73810,22710,65110,010
71 71st accessibleKeytrned chart8,2448,5968,2548,6038,1488,3549,88010,09810,46210,75111,64811,24311,03211,37410,5876,9237,5017,3137,7597,9406,760
72 North accessibleKeytrned chart14,13215,10215,56415,88315,88716,81117,42616,81316,32917,28717,80815,95114,94915,86414,21714,46815,22816,64016,22415,60315,084
73 Armitage accessibleSupporttrned chart5,3475,6505,8744,1924,1926,3706,2636,1476,0745,7985,7165,5045,4375,7255,4335,5155,5215,2654,9505,4195,290
74 Fullerton accessibleKeytrned chart11,31211,73111,97712,85312,69913,76113,67113,08112,49412,04812,55412,00611,23712,37512,55212,70813,06612,57713,77412,69012,404
75 74th/75th accessibleSupporttrned chart6,5136,8706,7797,4187,2396,7408,0277,8828,0117,8428,5558,0617,2497,0337,7217,8548,4406,9776,2346,8996,430
76 Diversey accessibleSupporttrned chart11,17911,05811,87412,08812,04712,84212,47612,19411,41611,48611,62711,14711,45112,33212,31312,94513,17813,07813,04712,09411,970
77 Belmont accessibleKeytrned chart19,28520,39121,05622,38521,70723,46223,90323,22122,06721,22223,49221,47721,66621,20019,98520,69220,67920,20519,56316,00418,654
78 Montrose accessibleSupporttrned chart7,3647,4047,3898,1438,2978,7108,9388,9017,8388,0379,4598,5288,5808,9488,2538,7048,7639,2319,5527,7758,655
79 79th accessibleKeytrned chart23,06324,50025,25426,75125,18626,61530,51130,97130,98032,08835,01932,77431,46731,38331,47731,58833,34831,34831,01331,26528,789
80 Irving Park accessibleKeytrned chart10,78211,11912,03412,87112,72514,13014,70714,83715,0757,85812,71812,94612,56812,36212,14012,43512,46912,43912,43610,37211,866
81 Lawrence accessibleKeytrned chart11,10311,73312,24212,34512,72313,45214,01114,66514,09014,63915,93114,02014,48714,22114,49015,23114,56815,36315,59412,56813,666
81W West Lawrence accessibleSupporttrned chart1,7021,6101,6701,6021,6901,7111,6331,6201,6521,8152,0341,8731,8951,6541,5411,7491,7881,4741,9061,6111,800
82 Kimball/Homan accessibleKeytrned chart16,30016,43417,89518,39117,07618,89418,68518,93318,11917,64919,19817,86617,91217,87718,71717,57119,33119,39819,95519,00218,423
84 Peterson accessibleKeytrned chart3,5683,6473,9504,0343,8954,4374,6284,4254,4314,6055,0034,3444,1884,1263,8754,0134,1584,2364,2623,8254,086
85 Central accessibleKeytrned chart9,1219,2689,86410,63410,08211,40411,53111,65311,61312,36113,41013,69212,49911,60212,20513,02512,57712,37312,76110,31011,873
85A North Central accessibleSupporttrned chart5496116116858809201,0329389239501,2047851,0969408438897598671,0077661,233
86 Narragansett/Ridgeland accessibleSupporttrned chart1,8942,1012,1872,3101,9912,5882,2462,2462,1311,9892,1122,0101,8071,5481,5161,6751,6241,5661,4601,4121,525
87 87th accessibleKeytrned chart10,91611,68212,22613,21012,50213,94415,25415,83416,36316,81517,03016,18416,21115,75516,78716,07616,05915,47814,67815,24714,733
88 Higgins accessibleSupporttrned chart1,3081,2941,3361,1631,2531,3391,2991,3241,2301,4001,6041,6421,6111,7451,7691,7771,6881,7401,7001,5151,996
90 Harlem accessibleKeytrned chart4,8094,6904,7584,5945,0835,3055,4405,2435,1715,2346,1575,7405,1124,9034,3994,4883,8343,9214,4854,1014,330
91 Austin accessibleSupporttrned chart6,0956,4946,5166,9596,8707,4057,9687,6797,8608,2249,4428,3098,2398,6948,1648,6968,2617,5108,7647,4278,129
92 Foster accessibleSupporttrned chart5,9386,1436,6836,9816,7117,3087,2217,9127,2567,7048,7117,2077,7927,5887,2887,6237,7997,3247,7685,8456,509
93 North California accessibleSupporttrned chart3,1523,1753,2873,4933,2633,7493,3963,4093,3173,3983,4073,2253,4252,9573,1112,5982,3882,1852,0042,1122,199
94 South California accessibleSupporttrned chart7,9738,5059,1119,5129,18010,39310,28010,35110,13410,42711,34110,0699,99810,93810,41210,08610,20910,22410,35310,35110,033
95 95th accessibleKeytrned chart5,3145,485
96 Lunt accessibleSupporttrned chart7637998498687748538959629289731,0241,2871,1609719751,0651,2151,3481,2741,2451,222
97 Skokie accessibleSupporttrned chart2,8402,9533,1783,3223,3714,0133,8744,2493,9674,0923,7853,6883,3253,4012,9913,5163,8623,8463,8374,1554,129
X98 Avon Express accessibleSupporttrned chart112915191628166109258353326356307344291395
100 Jeffery Manor Express accessibleSupporttrned chart5435876566876157128368318138037698608207779539011,201920948874906
103 West 103rd accessibleSupporttrned chart1,7282,0722,3212,6382,2482,6023,2623,1903,2673,3043,4793,0283,3243,3693,5293,4753,4773,5703,4933,5923,771
106 East 103rd accessibleSupporttrned chart1,0901,1361,3441,4001,4561,6661,8681,8491,7701,8281,6541,8081,7731,6051,7251,9452,1911,8222,3562,1382,012
108 Halsted/95th accessibleSupporttrned chart1,0631,0661,1831,2631,1381,5061,9041,9472,1482,2942,4152,1762,3032,3072,3852,4742,5522,8593,0792,8422,960
111 Pullman/111/115 accessibleSupporttrned chart2,9783,2433,4563,6733,3693,2656,4765,8506,1266,6196,3585,3355,5385,6735,7755,5125,7295,2515,5305,6365,363
111A Pullman Shuttle accessible (null)Supporttrned chart181193202217165
112 Vincennes/111th accessibleSupporttrned chart1,7601,9362,2682,3032,0852,3082,8322,7732,9203,1373,3323,3703,1043,0993,5943,5743,5723,4743,5853,3433,570
115 115th/Pullman accessibleSupporttrned chart2,7492,8233,6814,0893,7303,547
119 Michigan/119th accessible Ridership for CTA bus routes 34 and 119 is tabulated together through year 2000.Keytrned chart4,0184,2924,2404,6174,4864,8195,7146,1215,9096,1766,2835,0575,8005,6415,5655,2165,9715,003
120 NW/Wacker Express accessibleSupporttrned chart8148058519331,0021,0507047758711,3801,4181,8771,6271,7362,2581,5699978421,167901692
121 Union/Wacker Express accessibleSupporttrned chart1,1271,1161,2151,3861,4841,5097421,1371,2421,4231,6431,4541,8191,7352,1621,9751,1211,5151,3551,3721,530
124 Navy Pier Express accessibleSpecialtrned chart1,3011,4321,3381,1141,2821,3081,4021,3951,5851,6721,6051,6721,6841,3631,28779398
125 Water Tower Express accessibleSupporttrned chart1,1601,1321,2201,4041,5101,6741,6772,0332,0202,1482,3322,6912,7803,0442,4292,6551,9372,0032,4872,3961,996
126 Jackson accessibleSupporttrned chart4,6515,1284,9715,8555,9546,5866,0226,7977,2398,1599,4798,2238,9518,7618,9768,9458,8089,56910,0429,9719,246
130 Grant Park Treasures accessibleSpecialtrned chart6677686716986646621,2511,0707661,103263125236801
132 Goose Island Express accessibleSupporttrned chart241220225228277358261357319301367263
134 Stockton / Lasalle Express accessibleSupporttrned chart2,6942,7782,6213,1533,4983,5043,2793,1052,7092,6863,0092,8882,2481,7961,354
135 Wilson/Lasalle Express accessibleSupporttrned chart3,1763,0352,8513,4813,7564,0103,9523,9543,6243,8584,3063,8652,7062,5132,3202,5752,6142,8722,6992,3132,660
136 Sheridan/Lasalle Express accessibleSupporttrned chart1,8731,9001,7042,0032,0752,3232,4252,3122,1842,2972,3492,0221,9671,5212,0412,0761,9941,9162,0051,9301,789
143 Stockton / Michigan Express accessibleSupporttrned chart1,6421,7871,8841,9451,8451,8461,5231,4711,1431,2991,210763947910940
146 Marine/Michigan accessibleSupporttrned chart13,01013,23413,95014,58815,04215,46710,52910,3799,90011,70410,7059,9819,0368,6478,3799,1229,4369,56110,85310,4799,508
147 Outer Drive Express accessibleSupporttrned chart11,59711,97712,43113,58414,48914,98915,97015,37215,16716,39218,06614,92212,45211,75610,7029,8489,94310,1559,2899,3558,772
148 Clarendon / Michigan Express accessibleSupporttrned chart2,3732,3182,3772,3602,3642,3922,4112,4182,1521,9512,1482,5861,6561,8541,510
151 Sheridan accessibleKeytrned chart15,19816,38116,38017,95018,74420,24021,24023,28122,53522,82924,30320,15720,96821,23120,31023,13324,20425,47325,01024,73925,025
152 Addison accessibleSupporttrned chart9,1849,3789,61310,0059,22510,69110,24110,3099,6869,68711,15311,50210,79011,34110,62510,59310,77110,44911,62310,60812,496
154 Wrigley Field ExpressSpecialtrned chart6645627991,4271,6171,9061,1147721,0831341898433716668
155 Devon accessibleKeytrned chart6,1386,5207,1137,1597,1436,8227,6637,5817,5217,4617,3606,4476,1526,0676,4466,5767,0657,3917,5727,0766,772
156 Lasalle accessibleSupporttrned chart6,7516,5797,2807,8698,3388,5927,6418,7048,7199,45510,84110,3709,1518,9539,2268,5879,1948,7969,6719,3698,925
157 Streeterville accessibleSupporttrned chart4,3094,1484,2854,0224,5214,7094,4374,7244,3902,4162,2782,7613,2383,2333,1073,2373,2383,3993,2013,4903,588
165 West 65th accessible Ridership for CTA bus routes 63W and 165 is tabulated together.Supporttrned chart1551131201441179876726079135
169 69/UPS Express accessibleSupporttrned chart113195188217209186372373327385337377258243403468490794665
170 Univ. of Chicago = MidwaySupporttrned chart29381264296277271510305363344209330313210212206
171 Univ. of Chicago = Hyde Park accessibleSupporttrned chart6006767841,0296811,1377498728521,8571,303766399563549644351438
172 Univ. of Chicago = Kenwood accessibleSupporttrned chart8961,0771,0671,4111,1341,4881,0961,3271,5051,025853686424458501491440420
173 Univ. of Chicago = LakeviewSupporttrned chart169192126201209169194149177
192 University of Chicago Hosp. Exp. accessibleSupporttrned chart8258388608828601,007765852746685640593517
201 Central/Sherman accessibleSupporttrned chart1,9591,9242,0401,7811,7371,8571,9472,1451,9871,7521,5011,5261,6031,4141,5581,3491,4031,5141,2621,4231,731
205 Chicago / Golf accessibleSupporttrned chart7077047919018298921,1441,0769801,0599799601,1381,2281,200935
206 Evanston Circulator accessibleSupporttrned chart2303423814334355874165545305615756928581,000622468
0 Route Undeterminedtrned chart4,7553,3743,0537,21610,24211,7815,2243,1544,7682,9677,0065,5814,1053,8704,0784,7735,7154,2077,7307,6037,601
1001 Special Event RouteSpecialtrned chart109129442,5511584499481155951,420336
System766,894793,145812,574866,193848,745941,217935,811936,756919,168917,276984,622916,747896,803903,252897,533894,648921,523909,948917,920886,939874,760
Source: Chicago Transit Authority, Data Services

"Key" routes provide the backbone of CTA bus service. They include the most productive routes plus additional routes to provide geographic coverage of Chicago. "Support" routes are the remaining routes, which support the rail and key bus network.

Occasionally, a bus operator may enter the route number incorrectly into the fare box. If it is not possible to determine what the route number should have been, CTA considers the route “unspecified” and assigns it the route number "0".

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