Larry Dighera wrote:

In California, one could argue that the roadway markers constitute a
speed trap, as the aerial LEOs determine the speed of automobiles by
timing them between those marks.

Section 40802(a)(1): prohibits timing vehicles over a measured
distance, and 40801 makes using such evidence in assisting in a
person's arrest illegal.

The cops have a book called "Words to Use in Court". In this case, the
cop says that he matched the speed of the airplane to the speed of the
car, and then used the marks to confirm his own groundspeed. I am not
making this up.

Tim