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Drivers have been asked to halt their honking in an effort to reduce noise pollution.
Today has been designated No Honking Day in New Delhi in the hope of offering some relief from the constant wail of vehicle horns in India's cities.
Organisers are optimistic they can quieten the deafening beeping, but they do not expect instant results.
'It's like a cancer in the system. It will take a lot of time,' said Ravi Kalra, president of the Earth Saviours Foundation, the group behind the event.
'In Delhi, 70% of noise pollution is because of honking,' Mr Kalra told wire services as he campaigned with volunteers at a major intersection near the city centre.
'When people are stuck in traffic jams, they don't know what to do, so they just blow their horns without any reason.'
Mr Kalra said he approached the Delhi traffic police with his idea and found them highly receptive.
Since the campaign began in December, some 300,000 stickers and leaflets have been distributed. They carry various slogans, including one in which a dog says 'I never bark unnecessarily'.
Drivers honking in restricted zones such as near hospitals, schools and traffic lights - or in traffic jams - face a fine of 100 rupees, say city officials, but the law is rarely enforced.
In spite of No Honking Day, drivers on busy roads around Connaught Place in central New Delhi were still blasting each other with their horns this morning.
Mr Kalra, it seems, is an exception among Indians.
'I myself have been driving for the last 20 years and trust me I have never honked in my life,' he said.
