Check how this guy fooled the speed camera at Arizona, cool.
using 1 sensor only:
if a car touches the sensor (on) and reverses (off) it's the same if the car passes the sensor (on) and cross the line (sensor off). so using only 1 sensor isn't accurate. We can't really tell the diff if the car passed the red line or reversed off the sensor.
using 2 sensor:
--> direction of travel,
(sensor 1) (sensor 2) on road
when a car passes thru the sensors, they get activated in the following sequence, 1:On 2:On 1:Off 2:Off, once this combination is satisfied, it means a car has passed the stop line in the FORWARD direction. If a car stops over the sensors, and reverses, it registers as 1:On 2:On 2:Off 1:Off
the speed is not calculated by the sensors on the road.
“How fortunate for leaders that men do not think.” - Adolf Hitler
hmmz for expressway speed cameras... is it true that theres a 10km/h buffer? Say if the road speed limit is 90km/h, is it "safe" to travel at 90km/h ?
well..i a bit kiasi.. always drop to 70km/h when i pass the cte speed camera while i see the other cars speed by ... almost road-hogging liao.. haha
You will probably have a buffer with your speedo. Car speedo tends to overestimate your speed by 3-5km/h. I think the TP will not book you for doing 93km/h with speed limit of 90km/h.
I usually pass the cameras at 90-95km/h. (for 90km/h speed limit) So far, no tickets...
Top Gear make a test to see at what speed the camera will be failure to shoot you.Speed is 180MPH or so you will be "ghost".Good radar detector is Valentie V1 according to radar detector user.
just tot maybe can try during midnight when there isn't any cars..its stupid to wait at traffic light for it to turn green during midnight when you are the only car around..
but i think yanyewkay has made a valid explaination on how the sensors work..
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wow ... i thought the use some kind of radar like camera?
Using LIDAR, or Light-Imaging Detection and Ranging. Basically it measures calculates speed by bouncing pulses of laser beams, then measuring the properties of the returned beam.