1 was the first bus in Chennai from Thiruvanmiyur to Thiruvotriyur
Following this, any bus from Thiruvotriyur to southern Chennai/West via Parrys, Central named as 1 series

Thiruvotriyur to
1A- Thiruvanmiyur
1B-Tambaram
1C,1D-Thiruvanmiyur(Ennore based)
1G-Velachery
1J-Triplicane (this route came after 2011)
101-Poonamalle

Any bus which heads towards Perambur or its localities will be mostly a 29 series.
Perambur to
29A-Marina
29B-Saidapet
29C-Besant Nagar
29E-Thiruverkadu, 29K-CMBT

18 Series-Towards High court/TNagar to Tambaram via Saidapet
18A, E18, B18,18, G18, 18D

17 Series in Broadway to Vadapalani and its localities via Kodambakkam High road

Any bus connecting Broadway with southern Chennai via Marina will be of 21x /x21 series[there is an exception to this]
21G-Tambaram
21H-Kelambakkam
521H-Thiruporur (21H Extn)
21L-Velachery
21E-Iyyapanthangal
C21-Ottiyambakkam
T21-Kannagi Nagar
H21-Chemmenchery
L21-Velachery
PP21-Guduvanchery
S21-Jain College

Exceptions:
Certain x21 series are dedicated for routes from Thiruvanmiyur/Velachery to Tambaram

A21-Tambaram via Pallavaram ring road
R21-Tambaram via Velachery
V21-Guduvanchery via Velachery

Any 27/24/41 series will touch definitely Anna Nagar/Thirumangalam or CMBT and connect to the southern or eastern part of the city

27B-CMBT-Marina
27C-TNagar-CMBT-Thiruverkadu
27D-Villivakkam-Pattinapakkam
27L-JJ Nagar-Marina
27H-Avadi-Marina
24A-Anna Nagar West-V.House
24C-Avadi-V.House
41D-Avadi-Mandaveli

Any 47 series will connect areas around Anna Nagar(ICF/Villivakkam/Ambathur/Avadi) with Adyar/Thiruvanmiyur/Besant Nagar via T.Nagar,Valluvarkottam

All 19 series run in either OMR/ECR
via Adyar/Madhya Kailash

OMR:
19D-Chemmenchery
19K-Siruseri
B19-Shozhinganallur-Kelambakkam
519-Thiruporur
19B-Kelambakkam

ECR:
PP19-Parrys-Kovalam
19H-Kanathur
19G-Kovalam

Any 7 series run from Broadway to localities of Anna Nagar/ICF via Ayanavaram/Doveton

7A,7B,7E,7F,7H,7M(JJ Nagar)

Any 70 series will definitely pass/start thru/from Guindy,Vadapalani,CMBT

70A-Tambaram-Avadi
M70-Thiruvanmiyur
B70,C70-Guindy
D70-Velachery-Ambathur
170-KKD Nagar
570S-Siruseri/Kelambakkam
M70S-Kannagi nagar

60/66 series are mostly routed towards Pallavaram,Pozhichalur,Pammal,Anakaputhur

9,10,11,12(12B),13(triplicane) are miscalleneous routes which definitely touch either T.Nagar/Pondy Bazzar [most congested areas of Chennai]

8,56,44,34,2,4,20 are routes mostly North Chennai buses passing through Washermanpet/Mint

6 series connects Toll gate to Adyar/BN via Parrys – 6A,6D

23 series head towards ICF/Ayanavaram via Saidapet
23C,23V

114 -Redhills-Tambaram/Zoo

54 series towards Extra stage-Guindy-Poonamalle – 54F,54,54B,54L,54K

53 series towards Poonamalle in poonamalle high road

51 series will be mostly heading from Tambaram East/Medavakkam Koot Road Junction

T51-Thiruvanmiyur
C51-Thiruvanmiyur via ECR
A51-Broadway via Saidapet
V51-TNagar via Kilkatalai jn
H51,L51,B51 and many more
PP51Broadway via Adyar

37 series run via Vadapalani,Kodambakkam,Valluvar kottam and extending in both directions
37B,37G

5 series mostly pass through T.Nagar, CIT Nagar, Saidapet and connect to the different localities
5A-Tambaram East
5B-Mylapore
5G-Kannagi Nagar
5E-Besant Nagar-CIT Nagar-Vadapalani

5C-White board bus is an exception

49 series towards Porur
49A-TNagar
49-Iyyapan Thangal-Thiruvanmiyur (recently M49 was changed to 49)
549

42 Series via Periyar Nagar/Vysarpadi from Parrys – 42,242

46 series CMBT to Anna Nagar to Extra Stage

48 series run on ICF Ayanavaram road,Padi bridge – 48,248

59 series run Poonamalle High road and connect CMBT/Purasai -59,159E,159A

15 series run from Broadway to Poonamalle High road connecting Anna Arch,CMBT,MMDA
15B,15F,15G

71 series broadway to Avadi via New Avadi road

120 series run from Broadway to Avadi

M series are appropriately run for reducing the crowd –
Mostly there exists no relationship with above logical ordering

M1-Kilkatalai
M7-TNagar
M5-Kelambakkam
M18M-Vadapalani-Guindy-Tambaram
M15-Medavakkam
M21-Tambaram-Velachery
M23(it was changed to 23M)
M45-Anna Square
M119,M119B-Chemenchery
M19C,M19B-Thuraipakkam
M19A-Kelambakkam
M2A-Mint-Anna Square
M21G-Guindy
Mostly these buses will be white board buses

If it is 5xx /2xx /1xx, mostly it would be an extension from the last two digits.
5xx series covers a longer distance

Live examples:
519,219,219A->19B
521H (21H)
525->25G
254/554->54
549->49
568->68(CMBT-Thiruporur via Guindy,Madhya Kailash)
599(followed from PP19)

Exceptional 3 digit routes:
500/500b/c(follows Chenglepet pattern),502,515,555,587,522,523,597,576,588

Cut services serve 3/4th of the original route or a small extension added to it
ex: E18cut Tambaram-High court.

PS: We spotted this explanation given by Boopal Sridhar in quora.






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