I wish they would scrap them entirely. I used to do very long commutes in the car. If anyone here has done a lot of driving they will know that you tend to go into "autopilot", you are paying attention and know exactly what going on but you probably have no recollection of the last 20-30 miles.

Typically unless you are gunning it on the motorway you will be somewhere between 65-75 to be cruising with the other traffic and that variation of speed is normal unless you have cruise control.

I don't have cruise control in my car. The amount of worry and stress these things induce because I can't remember whether I was travelling at the correct speed (I didn't get a ticket so I must have been fine) drives me insane.