Eric wrote:

The police radar guns work off the doppler affect (for radar guns) or
the change in distance between pulses for lidar. My question is how
they account for angle, can a police officer who is at a 87 degree
angle correctly measure your speed?

This is so close to being perpendicular I doubt a radar would show any
speed at all.


It should only work going straight
at or away from.

Police radar works on the premise of relative motion. The object being
tracked and the radar unit must be moving towards or away from each other.

Also, do the police always have their gun on?

Depends. Some officers leave them on constantly. Some others use the
"hold" feature (turning of the transmitter)

Because it detects driving police cars who arn't shooting radar to my
visibility, does that just mean that the vehicle has an installed
radar gun constantly giving speeds?


I don't know what you are asking here.

.. And how would that account for
angle? If you know of a good website I can read please tell me.

Police radar relies on relative motion to read the speed. Either the
radar must be moving towards or away from the object or the object must
be moving towards or away from the radar. If the object being checked
is perpendicular to the radar, it will not show a speed. The greater
the angle to the radar (closer to perpendicular), the less the speed
will be shown.

I am speaking strictly about a radar that is operated in the "stationary
only" mode and not same or opposite direction moving radar, there are
other issues involved with those modes.


--
One lawyer can steal more than a hundred men with guns.