Berowra area, old Pacific Highway once had toll gates somewhere on this spot which has become a rest area and firefighter's base.
A drive to/from Sydney included a toll to use the long new descent to the Hawkesbury River on the beginnings of the M1.
  The old two lanes were a steep climb of horseshoe bends and progress was very slow or in fits and starts but of interest. Engines boiled. 
Relatives have said they packed a thermos and food to have refreshments during a traffic jam, like outside the car - perhaps it was an exaggeration.
The old Pacific highway, is much improved and continues from the above point and motorcyclists seem to like its challenges.