Bollywood megastar Amitabh Bachchan, who is in the capital to celebrate his grandson's birthday, can't stop raving about the post-Commonwealth Games Delhi, but says he is put off by the traffic.

"I drove in from the new terminal T3 of Delhi - a monstrous, clean and so far efficiently run facility. It's a city by itself in its size, the buggy cart coming in useful for transport within the terminal, " Amitabh wrote on his blog bigb.bigadda.com Tuesday.

"And then to drive out to a refurbished New Delhi, still clean and organised as a result of the leftovers from the Commonwealth Games, but still horrendous in traffic, " he added.

Big B is also impressed by his grandson Agastya's growth into a fine boy.

"I am here to wish my grandson Agastya a very happy birthday. He has grown up to be a fine gentleman even in his growing up years and days, " he wrote.