Thousands of drivers escape speeding fines in new tunnel because "it's complex"

Key paragraphs:

Almost 83,000 drivers have been caught speeding through a bustling Sydney tunnel – yet only 3000 have actually been issued fines.

The Rozelle Interchange in Sydney’s inner west opened six months ago, but according to a report from the ABC, while 82,658 drivers have been sent warnings by Transport for NSW, just 2851 have been hit with fines for going more than 30 km/h over the limit through the tunnel since January 25.

How complex is this tunnel???