For discouragement, there are FINES, HEFTY Fines such as Dubai, Abu Dhabi, 250 AED straightaway for throwing garbage etc. So, there shall be like 5000-15000 PKR fine for it with 20% given to police officers as commision who FINE people dressed as locals and not police mens and sending FINED Family or Individual back to RWP and ISB. Please, not kaali wardi wali police.
For the toll tax being doubled, its because you are going UP and DOWN, 25+25= 50 just like when u go to Karachi to Lahore, you pay about PKR 600 UP and PKR 600 Down.
All they did is, they curtailed there expenses, both ONE TIME and RUNNING Expenses by not making another Toll Plaza for it. Still it is reasonable, the road requires maintenance and they can cover a bit from here.