Every year on the freeway stretch between Campbelltown and the Picton/Wollongong exit, the Police set up a large operation at the truck stop around Menangle/Douglas Park
8-10 Police cars, sometimes more, marked and unmarked, the pull over supposedly modified cars and herd them into the truck stop where some fairly heavy handed defecting takes place.
It is centred around people travelling to Summernats which is January 3 til 6, so expect them from new years day on.
They target anything not absolutely stock looking, and patrol both North and South directions.
Even a set of wheels will get you roadsided.
Even if your car is on a trailer, if it has plates on it, you'll get done.
And don't be fooled into taking it off the trailer because they "want to have a look at it".
Best to avoid this stretch of freeway at that time.