Dear Sir,
The bus A21 frequency after 9PM onwards is very less. (Thiruvanmiyur to Tambaram)
It has happened to me on couple of occation where I come to stop around 9pm at perungudi and wait for more than 1 hours for A21 bus to arrive.
On first occasion I thought it is just on that day, but on another occasion the same happened hence realised that it is not the case.
Only Thiruvanmiyor to Pallavaram arrives around 9:40.
On the whole since more people started commuting this bus who work on companies at OMR and residing around tambaram.
Hence good to have more buses in this route.
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