This is document of 2016.FAQ on Fastag:
NETC Consumer FAQs
Link does not advise on free pass.
Read the complete SOP for NETC:
There is another problem with ICICI FASTag is that it's APP is not available on ios store (iphone) !I bought ICICI Fastag.
I used it on 4 tolls, worked flawlessly for me. One toll had return journey, during return journey it deducted the additional discounted fare.
SMS received for deduction was after 5 to 90 minutes after crossing toll. Email at time I have received after 16-20 hours. However the time of crossing toll was correctly recorded.
There may be some issues and I hope they will be sorted out over time.
I appreciate the efforts from all parties involved in implementation and operation of Fastag.