Have you even seen those portable police radar signs that tell you your speed?
823086
Yes, traffic cops use them to collect data on the average speeds of traffic at different times.  There's one on my way in from work on the midnight shift the speed limit is 30 and I usually try to go as fast as possible, 60-70mph just for fun.  But then again I am driving a squad car.
969389
check your local police department.
133718
There are two kinds of doppler radar. One is the radar cops use to tell if you are speeding. The waves come out of the radar gun and bounce off your car. Depending on whether your car is moving toward the radar or away, it either adds a little energy to the waves or takes a little away. This changes the frequency (how many waves per second.) The radar gun detects the reflected waves coming back (like an echo) and calculates the speed based on the difference between the original frequency and the frequency when it returns changed. The radar gun displays a number, and that's how fast you are going. They are very accurate.\n\nDoppler weather radar works in a similar way, but it is measuring the speed of the clouds. The faster the clouds move, it generally means the heavier the rain is (also for violent thunderstorms and tornados.) The radar picks up the movement of the clouds, because just like the metal in your car, they reflect some of the microwaves that the radar set puts out. Same as the speed radar, they can tell whether the storm is moving toward the radar or away from it, and how fast. A computer assigns each speed value a different color and that is the radar map you see on the news channel. It shows the clouds all moving at slightly different speeds, with the fastest ones being the most dangerous (dump the most rain, generate the most lightning, cause the most wind damage.)\n\nProblems with it. If you are not moving toward the cop car or away from it, they can't tell how fast you are moving. The radar can't tell anything about something moving at a right angle to the radar beam. The waves come out in a fairly tight beam, like a searchlight, only invisible. The object has to stay in the beam for the radar system to recognize the waves that are coming back. In the case of an object moving across the beam, the waves return with their frequency unchanged, meaning that it is not moving closer toward or further away from the radar, then it moves out of the beam and the radar doesn't know it is there any more. It does not 'see' it.  That's why it can't tell how fast that item is moving. \n\nI think that weather radar usually has several stations throughout an area, or the radar beam sweeps across the area like a searchlight, so it can show several overlapping pictures of the same storm. Also, if it is just an air mass (no clouds) the radar can't 'see' it, because the radar waves go through the air. Air is transparent to radar, just like it is to light.\n\nI haven't said anything about how the radar set generates microwaves, or about how military stealth jets are less visible to radar, that would be another whole long topic. I think you wanted to know how the radar works in relation to the outside world, not how it works inside. I hope this helps.
878712
Do you mean speed camera database?... which alerts you to the "safety camera" locations?\nCheck out www.PocketGPSWorld.com
1052710
Almost every state has laws that authorize law enforcement to exceed the speed limit during the course of their duties, as most receive special training to drive at faster speeds. The reasoning for this is that there are times when you don't want to draw attention to yourself as you attempting to get somewhere thereby alerting the bad guys.
279550
These provide them - http://www.crs-traffic.co.uk/
568313
I say don't give cops a chance to catch you. start slowing down the moment you see the sign in your eye field.
1074006
Yes...just give some sort of signal that you know the police are behind you.  Turn on your hazards and slow down.  Keep driving until you are in a lit area or parking lot.  A good officer will know what you are doing.
477166
Yeah, and how many times have you flashed your baby blues (or browns) and gotten off with a warning?\n\nBe happy that you didn't get a ticket for speeding. (Of course you can't. You woud rather rant about al ittle thing like this.)
798717
I think it's appalling that people with illegible number plates can get away with it.  I don't know why the police don't focus on this as a hazard on the road, but I would assume it's because they don't consider it important enough.  Maybe it's down to laziness or lack of resources, but it's not right.\nAnd as for using illegible number plates to break the law by speeding through speed cameras, I have to comment that speed cameras are there for a reason.  They are not there to catch you out; they are there to stop accidents.  Speeding is dangerous.\nSorry that this doesn't really answer your question but I had to state my opinion.
684515
speed limit for ambluance? ohoh..I should learn something here too.
964984
Yes, and also an online/offline thing to show if your there or not.  Maybe nothing more than just a green or red dot in the corner of your avitar
110630
I drafted a pretty good LIDAR (laser-radar) speeding defense using these websites:\n\nhttp://www.helpigotaticket.com/proc/\nhttp://www.tipmra.com/\nhttp://www.ticketassassin.com/\n\nThey give free advice for beating traffic tickets.  I must caution you to verify the law contained in these websites.  Hope this helps.
830779
Yes. All modern moving radars are capable of obtaining an accurate reading. How it works is this: a dopler radar sends a radar wave to a target, when the wave bounces from the target, it returns to the antenna and the speed is detected through a change in the frequency of the wave. When the police cruiser is moving, the radar wave bounces off stationary objects, ie. road, tree, guardrail etc. This speed is checked with the speedometer's speed visually by the officer. When a target comes through the radar field, the frequency change will be much higher. The radar subtracts the cruiser's speed and the target speed is displayed. The officer (in FL) has to make an idependent observation on the target vehicle prior to using the radar's speed. I have written only 3000 radar tickets and only two were ever contested. This was because I only stopped those going 15 MPH over the speed limit. If the violator had a good attitude, I would only charge the driver with going 9 over the speed limit. This would save him or her approx. $100.00.
714523
stop the policeman giving you a ticket for speeding.\n\nI'm sure we will all find this useful.
8556
It tends to be on technicalities.  Where there many vehicles moving with you and you were received a tickets?  Did this affect the radar gun effectiveness with your vehicle?  When the officer was pacing your vehicle, was his spedometer calibrated properly and in properly maintained?\n\nSo you see, there are many technicalities.  But if you are responsible, it is better to take a driving class if offered by the court to have the ticket dismissed.
777917
HUGEEEE can of worms here.\n\nPeople on cell phones\n\npeople that don't use signals\n\npeople that think the merge sign at the end of a ramp applies only to the interstate traffic moving at 70 mph and not their 45 mph ^%$\n\npeople that refuse to let you back over when you politly move over to make merging easier for them\n\npeople that think the 20 ft space between a big truck and the lead car was meant for them although they know it takes OVER 100 yards for the big truck to stop\n\npeople that read while driving\n\npeople that are driving 70 mph in a 70 mph zone, see a set of blue lights, and slow to 55 mph, cuz they might get a ticket\n\npeople that refuse to move over a lane, when someone is changing a flat on the shoulder\n\npeople who tailgate, cut off, play chicken, with vehicles that have burnt orange diamond displayed on them ( class 1 explosives)\n\npeople who think, the speed limit is fast enough, so they stay in the left lane...shutting down faster traffic for miles, rather than passing the clown beside them\n\npeople who think the left lane is their personal driving space...meant only for them\n\nI drive for a living...can ya tell?