they can consider routes like this
1. CMBT nungambakkam t nagar saidapet alwarpet mylapore raja annamalaipuram besant nagar thiruvanmiyur nilangarai injambakkam
2. CMBT virugambakkam porur nandambakkam guindy velachery perungudi kandanchavadi karapakkam solnganallur injambakkam.
3. CMBT virugambakkam porur nandambakkam guinty madiyakhailash besant nagar thiruvanmiyur nilangarai injambakkam.