1. If there is no other traffic and police car is not driving along aside the offender, the estimate can only be very coarse. If the car was going 70 in a 30 zone, then I think the officer can credibly judge that the car is "well in excess" of the limit. I don't think he could judge with any precision less than 10 mph and the higher the speed, the less precision.
2. If there is other traffic moving at a consistent flow, then officer can make a guess of the flow speed withing 5 to 10 and then state that the offender was passing that "5 to 10" over or "well in excess".
3. If the police car is driving at a certain speed and is passed by the offender in the same direction, the officer can credibly judge "5 to 10 over" his or "well in excess".
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In response to Marlene’s post: If you really have thyroid disease (Hashimoto’s) there is no vitamin supplement or diet that is going to effectively treat or reverse this condition, although there are supplement that may help to support thyroid function. Hashimoto’s is a progressive autoimmune disorder and it can cause wild fluctuations, causing you to swing from hyper to hypo until it finally just goes into a steady decline in hormone output. There are negative health risks when you let this go on too long without proper treatment. You must have prescription medication, whether it’s a “natural” thyroid drug such as Armour, compounded dessicated thyroid, or a synthetic hormone such as Synthroid (levothyroxine) and/or Cytomel (liothyronine.)
I am very athletic and helath concious and have been for most of my life. I was diagnosed with Hashimoto’s a few years ago and now that I’m being properly medicated (I take a combo of Synthroid and Cytomel) I look and feel better than I have in years! My athletic performance has increased, my hair is healthier, my skin is healthier, I never get sick anymore, I think more clearly, I’m happier, I have normal periods and I am no longer hanging onto an extra 5-10 lbs that wouldn’t go away no matter how hard I worked or how clean my diet was.