Very old cars have a margin of error on both directions. Newer cars are allowed zero margin for error on reading low but some margin for reading high (i.e., you are guaranteed to actually be going at the speed recorded or lower—you can never be speeding if your speedo says you’re under the limit).
Comment on ‘Something doesn’t add up’: the small Queensland town united in its fight against speed camera fines
SoylentBlake@lemm.ee 1 year agoa guaranteed margin of error in all cars older than 2004
Is there no guarantee from 2005 on? Am I missing a memo here?
Zagorath@aussie.zone 1 year ago
LemmysMum@lemmy.world 1 year ago
I misstyped. It’s supposed to be younger not older. Older cars are still required to show the correct speed however in 2004 manufacturers started putting in a 3-10 km/h ‘buffer’.
Cars manufactured before 2004 will generally have a very exact speedo that has the potential to be over the travelling speed under certain circumstances, eg bigger wheels than intented for the vehicle, overinflated tires, etc.
After 2004 manufacturer’s started putting in a ‘buffer’ of anywhere between 4 to 10 km/h due to new regulation preventing the previously mention situation.
For example a Taraga people mover can be anywhere from 7 to 10km under the displayed speed, Camry hybrids are almost always about 4km/h slower than their shown speed, Prius are mostly 5km/h slower on the dot.
Experience: Few years as a taxi driver.