Speed cameras are digital and record you speeding in milliseconds - about 5 milliseconds is all it takes to focus, record, and snap you at the set distance.
Your cars speedo has a delay of .08 to 1.5 seconds when it refreshes the vehicles actual speed to the speedo meter needle for you to read. When you are accelerating it calculates you are accelerating and reads this and the potentiometer is adjusting all the time so it keeps pace with your acceleration, But when you are coasting, the speedo is in a delay mode where to remain smooth it delays the feed to the needle movement. Ie; you could hit a dip and the out side of the dip will suddenly increase your speed in a forward direction, but as quick as it goes forward maybe by 5 - 8 Klm, it can come back as quickly and this would not show on your speedo as needle movement. But a speed camera will see this and record you.
An Easy Test.. Drive at 20 Klm per hour,-- stop the car - Look at the speedo and see how long the needle takes to set back to Zero... usually 1.5 seconds
Speed cameras are so accurate they by far exceed the accuracy of a cars speedo which the Vehicle builder will tell you is an Indication of your vehicles speed. Ie; it is not an accurate measurement of it.
You should never be able to use a far superior technology to test another technology especially when the technology the driver of the car has is manipulated for other reasons such as smooth operation.
Technical.
A wheel speed sensor reads the wheel speed 200 times every second, this information is sent along a Bus line to all the components which need it, ie; Transmission, engine management, cruise control, ABS, Traction control and the speedo. But the speedo only needs this information approximately every 0.8 - 1.5 seconds, if most of the readings are the same value in this period, then the needle remains the same. the speedo reader builds a graph, and the needle adjusts to this graph. So if there was a spike in the graph, but most of the readings were the same, the needle will not move, it would call this a soft fault.. But in this same period the speed camera would be able to record, and flash you for speeding..
1.5 seconds of unobserving a speedo over a 12 hour road trip is like missing seeing one falling star in a year and being fined for it. Speed cameras are just revenue Raisers.
While I have no time for people who do speed and are in the 10+ KPH range, I do question the fines for those under the 10 KPh from set speed cameras. There should be 2 speed sensors set up and the camera snaps you if your speed is the same or close to the first reading. This will bring the cameras in line somewhat between the two technologies.
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Comments: 11
I am against speeding.
It is just the police technology being used is not compatible with the the technology you use to observe your speed when driving.
It is that your cars speedo is never as accurate as the speed camera / radar which the police use. Your speedo could be reading 58 kph for 1.5 seconds in a 60 zone. so you would not think you are speeding and during this time, your actual cars speed could jump up to 68kph and you would never know it as your speedo needle would not move. but during this same time you could be caught on any speed camera or speed recording device the police use. as it is infinitely more accurate than your cars speedo, which is the only speed recording device you have available to you.
So unknown to you, you are booked for speeding even if it was just for 5 milliseconds.
A person who is speeding should be defined as someone who has done it for longer than 3 seconds or 20 meters. not 5 milliseconds and .0001 of a meter.
Modes that can't be upgraded, like light rail, will be obsolete.
They have had cameras on the toll booths here in New Jersey for years. If you go through the booth without paying or too fast the camera snaps a picture of your license plate.
And in most states, speed traps are illegal. i.e. using radar to snatch someone "speeding" while coming down a steep incline or immediately after a rapid speed restriction change. Your description would fall under a speed trap, and you can fight it camera or not (I know, I've done it. Not with a camera, but radar.) These things aren't being used on speed bumps. They are installed on major highways where they are actually needed.
You stand the same chance of being caught on a speed camera and on a digital radar as you would if you didn't have a speedo in your car. because your speedo tells you your wheel speed and a speed camera tells you your speed over the ground. The speedo is (By the Manufactures standard) An approximate only, where as a digital or speed camera is an exact reading.
Your speedo is set up so as not to flicker, so it has a delayed reaction, a speed camera has no delayed reaction.
Your finger print logic is as applicable as comparing an elephant to a snowflake.