bentonh@tekid.UUCP (Benton Holzwarth) (08/16/83)
If there was a sign that displayed your speed without
setting of your radar, it could be that your speed was
measured in some other way.
Did you happen to perhaps notice some of those rubber
hoses stretched across the lane? Two of them a known distance
apart could provide the information to the timing electronics,
and probably run more reliably and with less protest from the
environmentalists then the radar style meters.
_benton_
Tektronix, Oregonbruce19@ihuxi.UUCP (08/24/83)
I have to comment on all the "unmanned" and "radar" speed trap articles. Until three years ago I worked for a company that made speed detectors that did not use radar or rubber hoses. Speed was determined by measuring the interval between two inductive loops in the pavement. These same loops were also used to detect if there was left-turn traffic at multi-phase lights, to detect if a car had approached a parking lot gate, etc, etc. The detectors balanced two or three turns of wire in the pavement against a reference inductor and the car's iron near the loop upset this balance and triggered an output. These devices are less costly than radar, more reliable than radar, not regulated like radar (FCC), etc. You can be clocked and your radar detector will never go "peep".
kwmc@hou5d.UUCP (08/24/83)
One problem with using inductive loops under the asphalt to measure speed, is that people will very quickly learn where they are, and slow down when passing over roads controlled in this way. Ken Cochran hou5d!kwmc