Originally Posted by 
Lotz-A-Landies
				 
			Peter
Take the plates off the car, ring the blue slip inspector, make an appointment with him and drive directly there.  Same if you need mechanical work first. That is legal.  You don't need to show a "Traffic" sign in place of the plates but it doesn't hurt!
If you are worried you can also get a Unregistered Vehicle Permit for the day or period.  Just be aware that it you hit something on the way without a UVP you have no 3rd party personal insurance, so you have to pay for any injuries out of your own pocket.
For those suggesting asking and pleading with the RTA for leniency - don't bother - the RTA has no heart and no feelings.  3 months is the cut off - after that it's a blue slip inspection.
Diana