>> someone mentioned to me once that whilst GPS speed is accurate only on a flat road. An incline will
>> impact the accuracy (something to do with right angled triangles).
I drove a van fitted with the Lightfoot driver monitoring system a while back. On one particular downhill entry slip road to the A1(M) it would consistently go haywire, because it believed the van was accelerating much harder than it actually was.
Its other foible happened when leaving the loading bay behind the shopping centre in Welwyn Garden city and immediately entering the underpass at 10mph, if I emerged at the other end doing 25mph the system read it as an almost instantaneous gain of 15mph at an improbable rate of acceleration - giving yet more negative marks to the driver.
|
