Colorado statutes do not specify a minimum distance for pacing, but most courts will require a minimum of 1/8 to 1/4 of a mile. Case law does not set an exact criteria, but it has been noted:
A person of reasonable intelligence may express an opinion of the speed of an automobile or other moving object coming under his observation without proof of further qualifications. Eagan v. Maiselson, 142 Colo. 233, 350 P.2d 567 (1960) - this involved a civilian's estimation of speed re: negligence in an auto accident.
Most police officers are trained in how to pace, usually consisting of going out with an instructor and a radar unit and visually estimating the speed of vehicles traveling on a roadway.
The officer needs to prove they were able to pace a "reasonable distance" but that has never been established.
To challenge the officer's testimony, one would want to know the officer's training, how long the officer paced the vehicle (both distance, and time), whether there were hills, curves, etc;
If the cross examination puts enough doubt in the judge's mind then they will dismiss the ticket.
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