National Highways Authority Of India [NHAI] — Speed limit on NH48

What is the point of building 6 lane road if the speed limit is 80 km and some times 40 km on national highway. Its awful to drive at such a low speed when u are paying for road infrastructure, roads are built to save time and travel at ease and not sleep while driving, 40 is just not done on national highways. On NH 48 from gujrat maharashtra border to mumbai the speed limit has changed just to cash on money and not to make life easy for travellers. Please when india is moving forward with developing infrastructure we are pulling it back by reducing the speed and time consumed by travelers.