A bench headed by NGT Chairperson Justice Swatanter Kumar asked the state government to file a detailed reply after proper verification within three days.
The direction came on a plea filed by a taxi association against the June 19 order of the NGT which had put a cap on the number of permits to these vehicles.
While the taxi association claimed that there were 2,100 taxis, the Himachal government said that there were 2,517 taxis registered.
It also directed 'sarpanch' of the Palchan panchayat, which had opposed the 9 km long Palchan-Rohtang ropeway, to appear before it on the next hearing.
More From This Section
On June 19, the tribunal had allowed 100 more tourist vehicles to pass through the eco-sensitive Rohtang pass area.
The panel, which had earlier permitted 800 petrol and 400 diesel vehicles to go beyond Manali on Rohtang Pass road, had allowed more vehicles to the picturesque location to ensure that more tourists are accommodated.
"The other cars will be issued permits for strictly complying with the directions contained in the permit. No taxi or vehicle should re-ply or take a return trip without crossing the borders and not more than twice a week," the circuit bench had said.
On the issue of issuing permits, the bench had held that online registration for permits to Rohtang should be opened at 10 am every morning and then again at 4 pm on the same day instead of 12 noon as done earlier.