It is very difficult to remain objective when motorists are continually bombarded by all sorts of hassle.
However, at times we ourselves are responsible for exceeding the speed limit after allowing some person frustrating our progress.
I too sailed past a speed van on a dual carriageway with a 70 limit. A quick check of the speedo was enough to worry me for a fortnight.
I checked online and the Chief Officers whatever stated it was usual to give 10% plus a couple of miles an hour so an 80 would be 77 plus the discretionary bit.
I think in most cases it depends on the road, the driving and the density of traffic. A 30mph limit any transgression would be punished as 40 and 20. Motorways are special.
Remember as speeding is an offence that needs a notice of intended prosecution, if the police don't contact you within 14 days that's it.
Unfortunately it is very difficult with modern cars to stick to 30 without going a couple of miles an hour over.
Incidentally, today's news male bought a Ferrari for £80,000 an hour later written off. Wet road. So back to being able to handle what you are driving.
Off subject, Jocko mentioned his Triumph 2.5pi. Driving course, Triumph 2.5pi flat out on the A30, Instructor told me to take the hand brake off, I told him my foot was flat on the floor, so he leaned across and tried to put his hand under the throttle pedal to check. 100mph max. We were allowed to exceed all speed limits EXCEPT 20/30/40 as part of our training. No markings on the car no blue lights nor two tones all a case of making sure it was your driving and not depending on the normal 'aids' of a police car. All we ever got was make progress. What I do not understand is why it seems learners are not taught according to Roadcraft. Position on the road, anticipation and adequate signalling surely if taught straight away must be a benefit. It also appears to be a case of passed my test so I can forget everything. Sorry but it is pertinent to the subject after all we can do everything to try and drive economically and safely and then along comes mr average.