Take-away food containers were the dominant item. It seems that people think it is okay to toss anything out the window. Inadequate securing of loads is also a major problem.
Fortunately, in the future, it will be possible for beverage containers to be returned to a reverse vending machine. The container deposit legislation announced by the NSW Government prior to the election is expected to take two years to implement.
The government also introduced a scheme on 1 March 2015 where littering from vehicles can be reported to the EPA via a website or app.
To report littering from a vehicle, you must have observed the litter being discarded or blown from the vehicle. Seeing litter next to a vehicle and assuming that it came from that vehicle is not sufficient for a valid littering from a motor vehicle report.