Buena, Washington Speed Traps
Several WSP cars will sit on the Buena onramp while an aircraft rotates North of the freeway watching the marks on the highway. Aircraft rotation is opposite the direction of traffic. Highway marks are at 1/2 mile intervals and are (measured) 20 feet short consistantly over a two mile distance. 85th percentile is 75 mph. They pull people over in job lots, and as usual, add 5 mph to whatever actual speed they measure.