Real life case
A decrypted TomTom triplog was used to do some measurements to calculate speed and distance just before a traffic accident happened. In this real life case, there was a driver who was not driving to fast and was in time to hit the breaks.
He should have been able to avoid a collision, but he was hit by a car behind hem, which made him hit the car in front of him.
Total distance of the route we took is 613.54 meters.
Timeframe is 2012-04-01 16:12:00 to 16:12:29. (16:12:29 is the last point in motion, after that you can see a lot of “ pins” more or less on the same spot (probably a 4 by 4 meter range where al gps-fixes are found.)
If Google earth gives us good information we can calculate that the speed on this part was an average of: 613,54 meter / 29 seconds = 21,156 meter/second = 76,163 Km / h.
That is way beyond the speed limit of 110km/h at that location (but still an avarage)
If we take the last seconds before the crash:
16:12:19 94,68 km/h
16:12:20 88,92 km/h
16:12:21 79,2 km/h
16:12:22 66,96 km/h
16:12:23 51,84 km/h
16:12:24 36,0 km/h
16:12:25 25,2 km/h
16:12:26 10,8 km/h
16:12:27 7,2 km/h
16:12:28 25,2 km/h (speed goes up. The car got hit from behind)
16:12:29 14,4 km/h
(measurements where made by pointing out in google earth, so not very accurate. We are still looking for a way to convert a triplog.kml file into a file with good speed and distance-calculations)