The videos had been circulating on WhatsApp and other social media platforms. However, when Amitabh Bachchan saw it on his timeline, he was so fascinated that he retweeted it calling it a superb idea! The video that is being referred to here is of the LED lights at traffic signals in Hyderabad.

The Hyderabad traffic police and the Greater Hyderabad Municipal Corporation (GHMC), in a new initiative, have installed LED lights on the stop line to ensure motorists and car drivers stop the cars before zebra crossing to ensure smooth flow of traffic.

When Big B saw this tweet, he retweeted with the caption, "this is a super idea .. most effective (sic)."

Here's the tweet with the video:
 

this is a super idea .. most effective