Who'd have thought my first post to ASF would be non-stock related...
Anyways, my tips FWIW:
- make some detailed notes about exactly what happened
i.e. day, date, time, location, weather, lighting, number of other vehicles nearby, any nearby speed signs, number of warning signs, etc etc
- you might need to have a reason as to why you remembered all these things (if this goes to court) - i.e. going to all the trouble of remembering these details isn't the norm (esp if you weren't speeding)
- i'd suggest writing a letter FWIW once you receive your infringement notice (it's never worked for me, but has for a couple of friends)... something along the lines of "sorry, first time offence... i believed I was travelling within marked limits etc etc. Don't admit to anything, you aren't going to stand up and say in court
- consider hiring a lawyer...
My tale of woe with a lawyer was contesting a speeding ticket - supposedly doing 149 in a 110 zone (driving down to Canberra). At the time, I denied travelling that fast - I said I was doing 130... and ended up hiring a lawyer & taking it to court. After about $10K, 12months & a lot of wasted angst - on the day of court the police (before the hearing) agreed to reduce the charge to 130... I was not happy....
But I did learn a few things - my lawyer recommended & we ended up getting a forensic radar specialist to review the location - there are quite a few things that can affect a radar reading - if there is a bigger vehicle (like a truck) nearby, that can be picked up as doing the speeding, but you get pinged. Also, signs & some other structures can cause deflections that cause inaccurate readings....
My advice re: lawyer, is find someone that deals with traffic matters mainly - and see if they can give you a fixed price for what is involved - a friend of mine who was in a similar position at a similar time (she was booked rushing back to Bathurst), and hired a local lawyer that charged her $800 for a similar result.
Good luck