I’m not sure where you read this but virtually every word of it isn’t true. Laser units cannot be used while moving. Due to the nature of LIDAR, it must be specifically aimed at a targeted car. Useful for stationary speeds traps, but have absolutely not replaced radar units. If LIDAR is a concern, an active counter measure (laser jammer) needs to be employed because detecting a LIDAR signal almost definitely means an officer is specifically targeting you. I don’t have a laser jammer so I turned laser detection off. It also is not in wide use in my area.
Virtually every patrol car in this country used for traffic enforcement still has a radar unit installed. Radar is not some mystical thing that has somehow advanced beyond the realm of science. Devices transmitting electromagnetic radiation (like these radar units) are regulated by the FCC. There are certain bands of frequencies that they are allowed to transmit in that are public knowledge. In its simplest form, an RD is merely an antenna used to detect radio waves in the bands used for police radar. That detection range can measure in the miles depending on terrain. Due to the way radio waves propagate through space, you don’t have to be targeted to detect the signal.
In practice, this means in the unlikely case an officer has his radar off and only turns it on to measure your speed, you’re right that your detection will be too late. However the more common situation is that an officer either has the radar turned on full time or is intermittently using it to measure passing cars. In either of these cases, you are warned well in advance of the officer even seeing you.
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