Car with 5Adults + 1child (7yrs)?

Travel Info
what are the penalities for trying to drive 6pax (asians' pinned-sized) in a Collora sedan in Newcastle, Sydney?!
here in S'pore is not a big issue but i heard it's a real offence in OZ.
pls advise

Travel Tips

This may not be a big issue in Singapore, but take note the insurance only cover 1 driver and 3 other passengers, should an accident happen, insurance claim will be a problem.
Others

Yep, Take note of Tan's answer, it's a goodin'.
If caught (before you have your accident), you'll be for the high jump, with cancellation of Licence and possibly a jail term too.
Get a bigger vehicle, one with at least 6 seats - and seatbelts: a Toyota Taraga, LiteAce, HiAce or Previa; or a Honda Odessey, or something similar.
There's no shortage of suitable waggons.
Driver T
You can only have as many people in a car as there are seats for them. Children must be in a seat and may not sit on someone's lap. Seatbelt wearing is compulsory and if a passenger is without one, both the passenger and the driver will be charged. The police in Australia may stop any vehicle at any time for any reason. Driving is a privilege not a right. If you try to drive with six people in a Corolla you will be booked and could face a variety of charges including Driving without due care and attention; driving in a manner dangerous; overloading a vehicle; failure to wear seatbelts etc etc

There are vehicles that will legally carry six people. Get one of those or get two small cars.
get yourself a tarago van and be done with it.

It is illegal to overload a car, and being tourists, you could quite likely be deported.