Not always accurate, road crews often remove paddle markers for maintenance and their accurate placement after that isn't guaranteed.
The only accurate markers are those painted on the roadway by the cops for aerial pacing.
Geez, Nomen, why just the "high end models"?? They can afford the speeding tickets more than the poor folks can. The carmakers should put your idea into ALL new cars. Arthur
differential
I believe that Chrysler has incorporated an electronic calibration, to match up with the various tire sizes, for years now. But remember, in various countries, a Speedo that reads to slow is outlawed, thus errors have tended to fall in the other direction. This benefits the company since warranties are tied to the indicated miles on the clock.
Richard.
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.