TV channels showed the 58-year-old BJP MP from Nagpur riding his white-coloured scooter to the Sangh headquarters in Mahal area of the city to meet RSS chief Mohan Bhagwat amid efforts by the party to form government in Maharashtra.
When pointed out by journalists about him having violated the rules, Gadkari refused to comment and entered the premises with a man riding pillion and another scooter in tow.
Congress general secretary Digvijay Singh strongly reacted to Gadkari's action, saying it reflected the "attitude of the leader and the party".
"It is a very small thing and for anyone else it wouldn't have mattered...for the transport minister of the government of India, who is violating the law which he had to be enforcing, then it does make a difference," he said.
"This reflects the attitude of the leader and the party, whether they believe in following the rules or not," he said.
One of the TV news channels claimed the former BJP chief was earlier caught on camera riding a scooter without wearing helmet in December last year when he was not a Cabinet Minister.
With the shoe on the other foot now, it was not immediately known if Nagpur police was contemplating booking the Union Minister for violating traffic rules.
According to Nagpur traffic police website, wearing helmet is compulsory and violators will be charged Rs 100 under Section 177 of the M V Act-1988.

Meanwhile, when contacted, Nagpur police traffic branch inspector P B Lokhande said police were "conducting an inquiry".

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