On Wed, 10 Aug 2016 15:41:16 +0100, cowabunga dude wrote:



Unquestionably wrote:
On 8/10/2016 8:11 AM, Pat wrote:
On Wed, 10 Aug 2016 03:09:05 -0400, wrote:

I've always wondered how they work, and
why they dont detect cars going the opposite direction.(I assume they
work on radar). ???

Yes, they work on radar. Cars going the opposite direction DO get
detected, but they show up as going a negative speed. The built-in
software just ignores those signals and displays only positive speeds.
Interesting.
Seems obvious that they must employ a unique radar frequency as
oftentimes my Valentine One (a great radar detector) doesn't utter a
sound even though it's set to report ALL threats.
The silent treatment occurs with a fair number of the portable "Speed
Alert" trailers the police move around to provide a courtesy warning to
motorists as well.

Those speed detectors always show my vehicle is going 3 mph slower than my speedometer.

Because your speedometer (like in most cars) is ****. Compare it with your GPS it should be dead on.

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