It is more than a ticketable offence - in fact a criminal act in NSW
NSW Crimes Act Sect 49A
Throwing rocks and other objects at vehicles and vessels
49A Throwing rocks and other objects at vehicles and vessels
(1) A person is guilty of an offence if:
(a) the person intentionally throws an object at, or drops an object on or towards, a vehicle or vessel that is on any road, railway or navigable waters, and
(b) there is a person in the vehicle or vessel, and
(c) the conduct risks the safety of any person.
Maximum penalty: Imprisonment for 5 years.
(2) This section extends to a vehicle or vessel that is stationary at the time that the object is thrown or dropped.
(3) In the prosecution of an offence under this section, it is not necessary to prove:
(a) that the accused was aware that his or her conduct risked the safety of any person, or
(b) that the object made contact with the vehicle or vessel.
(4) In this section:
"road" means a road or road related area within the meaning of section 4 (1) of the Road Transport Act 2013 .
"throw" includes propel.
"vehicle" includes:
(a) a motor vehicle, and
(b) a train or tram, and
(c) a bicycle, and...
So the police should have investigated, and you ought to be complaining to the police commissioners office
about being so seriously misled.
This section was added to the crimes act after someone was killed near Wollongong by a drug-addled
idiot who was throwing rocks at cars from the top of a freeway cutting. But it clearly covers your
case too - because it can be just as lethal. 250 g of popper juice could kill someone when
propelled at 40 km/h - and even an empty one would look lethal and could cause you to react
and fall into the path of other vehicles etc.,.
It may be tricky to prove the object was intentionally thrown from the vehicle, unless the half-wit that did
it was half-witted and ignorant enough to admit it (or his driver friend dobs). Sometimes people are that dumb. And, in any case,
the educational benefit that acts have consequences might still get through when police knock on doors.
Next obstacle could be that the person that did it may be a juvenile, and escape prosecution via the young
offenders act. But at least they'd get a shake up. And again, they'll hopefully be educated about what
might be the outcome should they continue behaving like that as an adult.
Don't just pursue it through the EPA - load both barrels of the shotgun and complain to the Police
Commissioner about being misled and the failure of your local police to investigate a criminal act
appropriately.
Cheers
WombatK
PS I am not a lawyer, and the use of intentionally in the act may not be as problematic as I've
suggested - it might only be to allow no criminality where the object falls or is thrown
by some accidental means (e.g. slipped from your hands while passing it to someone in the
car because the car hit a bump).