Hell West & Crooked, the ISA schools are probably well aware of the requirements of longer distance travel for sport. Poor Kinross are in Sydney every second week, while the Sydney teams only go to Orange every second year.
In modern GPS (apart from the irregular TAS games), the expedition to North Parramatta is the biggest regularly undertaken. Like the ARU, it is perhaps understandable if they get a little spatially disoriented if they venture west of the suburb known as The Kings School.
ISA teams would understand the logistic challenges imposed by the roadworks on the Great Western Highway, and adjust departure timings better than the schools that don't travel that road regularly.
That bit coming into Wentworth Falls nearly always produces a traffic clusterf&^k that Parramatta Road Peak Hour would be proud of.