If you haven't got a speedometer why don't you use a GPS to see how fast you are going or even a smartphone with GPS, or better still fix your speedo, just sayin'
If you haven't got a speedometer why don't you use a GPS to see how fast you are going or even a smartphone with GPS, or better still fix your speedo, just sayin'
Thing is: Without some kind of standard to measure each device against, how would one know which one is the correct one? Or the more correct one?
Known distance divided by time equals speed. Just south of Franklin on US 31 is a speedometer check area. Five miles of accurately spaced mile markers. 60 miles per hour equals 60 seconds. If you complete a mile in less than 60 seconds, you are going faster than indicated. If it takes you longer than 60 seconds, you are going slower than indicated. Stopwatches are your friend. Know the distance between any two points and how long it takes to go between them and your basic grade school math will solve the issue for you.
That is..........assuming you passed grade school math.
Ed: I just downloaded a Speedo app for my iPhone, gonna make a run to Indy in a few so I'll test it against my truck's digital speedo and Sportrac Pro gps. Data incoming
If you haven't got a speedometer why don't you use a GPS to see how fast you are going or even a smartphone with GPS, or better still fix your speedo, just sayin'
Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle, to ensure they are not liable for drivers violating speed limits.