I am not sure about other states but If you come to Kerala NH, especially between Thrissur (Mannuthy)to Angamaly( 50km distance) on everyday morning hours between 3am to 9 am, you will agree with me that almost all the comments are worng.
You can see many old Volvo buses running at more than 100 km/hr with 1) heavy thick balck smoke and tracter like engine sound. Some of them you can see the engine in rear side because the rear engine room door is open.
2) I agree on this, still they are men driving continuesly for many hours without sleep in night and they may be sleepy. Doing over speed and the lights of oncoming traffic make them more tired
2-3 years before whn Kerala MVD & police fixed speed radar cams on NH in Kerala, it was a Volvo had the record of 3) top speed 155 km/hr at Alappuzha NH. I read it in newspaper at that time. I am not sure Volvo can achive that speed.