When travelling on a motorway that is 100kph, I usually travel at about 102 and keep it there using my gps so I know it's accurate, however when facing a headwind I can briefly creep up to 107 for a short while then I'll back off, I think I'm OK with that, but then there are times when I'll pull out to overtake someone travelling in the low 90's and next thing I know they speed up and I'm overtaking at 120 briefly which is rather annoying. I'm sure many people recognise this situation, has anyone been booked travelling at 120 very very briefly? Also I was wondering how safe is it in various states of Australia with regard to travelling at say 5kph over the limit. I have heard anecdotal whisperings that Victorian police will book you for that but not in Queensland. Anyone have any experience of being booked for travelling marginally over the limit?