James Deakin: "The truth about speed cameras down south"

**Retz** · March 17th, 2012 05:35 PM

Originally Posted by Walter

Speedometer readings of most cars are 5-10% faster than actual speed, so 110 kph might be only 100-105 kph actual speed.

Is this correct? how accurate is our speedomter? and whats factors will affect its accuracy?

**ghosthunter** · March 17th, 2012 05:58 PM

Originally Posted by Retz

Is this correct? how accurate is our speedomter? and whats factors will affect its accuracy?

Size of tires generally affects the accuracy especially if you have aftermarket wheels installed.

**niky** · March 17th, 2012 07:32 PM

Originally Posted by Retz

Is this correct? how accurate is our speedomter? and whats factors will affect its accuracy?

As said... tire size affects it. Manufacturers sell cars with different wheel options, and they're not always equivalent in size. Heck... even tires that have the exact same designation will sometimes have different sizes.

And stock speedometers are not calibrated. That is to say, the ECU knows exactly what speed your car is supposed to be going (within the margin of error created by the tire size issue), but the speedometer needle is not calibrated on most cars unless they're US highway patrol vehicles.

Most cars are within 5-10% of true speed (usually over). Some are worse... reading as much as 20% off at 100 km/h.

**CVT** · March 17th, 2012 11:08 PM

Parang may conspiracy ngayon sa SLEX,- approximately 80KPH lang ang takbo sa lahat ng lanes.... Mas delikado iyan, dahil kung may aantok-antok,- maraming sasakyan ang madadamay....

15.2K:froggy:

**renzo_d10** · March 18th, 2012 12:01 PM

Tingin ko yung underspeeding huhulihin lang nila when you're caught by a speed radar. Hindi naman nila makokontrol tiyan mo kung nagugutom ka na diba.

I agree. 100kph is too slow, and I doubt if people would even reach that. Normally, because of fear they would just go 80-90kph which I find a bit dangerous. Though SLEX is more congested than SCTEX, hindi mo pa rin maiiwasan antukin behind the wheel because of the relatively slow pace you are maintaining wherein if the speed limit is increased to 120-130kph magkakaron din ng adrenaline rush -- somehow -- yung driver.

Admittedly I'm one of the violators of the speed limit whenever I go south. I cruise around 120-130kph and still there were lots of people who were overtaking me via the passing lane. Medyo nakakatuwa nga tignan eh. Hehe. Pero sa SCTEX, while I'm running at around 140kph and this particular Carens overtook me inabutan ko siya dun sa toll, he got caught and I wasn't. :hysterical: Ohwell. Hello North!