There was not even a single voluntary response to the Delhi government's ambitious scheme of persuading operators of old diesel-run light goods vehicles (LGVs) to switch over to new CNG-run vehicles by offering them a whopping Rs 80,000 (12.5 per cent) tax incentive per vehicle. Out of a total of 38,500 diesel-run LGVs registered, over 5,000 are between 14 and 15 years old The scheme which was announced in February this year to persuade owners of 14 to 15 year old diesel-run light goods vehicles to switch over to more eco-friendly CNG-run ones, closed on April 30.