National Highways Authority Of India [NHAI] — toll fee exemption

Address:

Chhindwara, Madhya Pradesh

Sir I'm serving in Indian Navy, while on holiday can I avail toll exemption on my personal vehicle.u
Actually I was charged the toll tax stating that the toll exemption is only for defence vehicles not for the personnel vehicle of a serving personnel .
I have confirmed with lots of my colleagues, all of them are availing the exemption but the toll tax near my place is not giving .
And please may I know that is there any limit on the number of times I can avail exemption.