One need to avoid elevated flyovers or underpasses which will have clear signboard to ban cycling.
These stretches won't have the pavements to avoid the speeding vehicles, so it's best to take service roads instead.
Be careful on service roads too, which will have bidirectional traffic. I recommend not to stop or spend too much time due to risks of being mugged specially at night.
In general it's best to ride in groups/pairs specially if you are riding first time.