The Supreme Courtyesterday refused to extend the April 30 deadline fixed for the diesel-run taxis for their conversion into CNG mode.
Authorities in various locations today impounded diesel-run cabs plying on the local routes in the national capital.
"Instructions have been issued to concerned authorities, including transport department, to impound diesel-run taxis plying in Delhi-NCR," said a senior government official.
According to Delhi transport department, about 60,000 taxis are registered in the national capital and of them 27,000 are running on diesel.
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The SC order is not applicable on cabs having All India Permits but most of the diesel cabs ply on local routes. The ban will essentially bring down the availability of cabs in the capital.
"As per rule, taxis having All India permit are required to cover a distance of around 200 km. Taxis having All India permits cannot ply from one point to other point inside Delhi, Noida and Ghaziabad," the official said.
Cabs going off roads may inconvenience thousands of commuters as many diesel taxis ferry people from Delhi, Noida, Gurgaon and Ghaziabad.
The bench, also comprising Justices A K Sikri and R Banumathi, had on March 31, extended the deadline till yesterday for conversion of all diesel taxis to CNG.