"All these buses which you have designed, why are they so noisy? DTC is planning to procure 10,000 buses. Why don't you design such buses where the seat of the driver is at a lower level so that he has greater vision on the roads. This would help in minimising the accidents," a bench headed by NGT Chaiperson Justice Swatanter Kumar said.
The green panel also directed both bus manufacturers to inform it about whether they were capable of running high- powered CNG buses which can even ply on hill stations.
The Tribunal had issued notices to Tata Motors and Ashok Leyland companies through their Managing Directors and directed their senior-most officials to appear before it.
Earlier, the Tribunal had flayed Delhi Transport Corporation (DTC) for running its air-conditioned buses without passengers for a major part of the day.
"Unfortunately, we also live in Delhi. Your huge buses ply empty for at least five hours a day. Have you rationalised this aspect? It is shocking that nobody listens in DTC. Your buses are more than overcrowded.