h a l f b a k e r yExtruded? Are you sure?
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Recently, the dashboard illumination failed in the car I was driving. Trying to gauge my speed, at night, alone on a road with little side decoration was not fun.
If some sort of road marking - maybe the centre lines or the "cats eye" reflectors - were paced so that at the posted limits they went
past at a constant rate, gauging the speed in similar situations would be easier. Perhaps, after time, we would develop a subconscious sense of timing for it.
(A quick calculation, by the way, shows that:
if the rate is, say, 2s, and
the driver is out by up to 0.5s, and
the car speed is 60km/h, then
the approximate error in the speed is 15km/h. At 100km/h, it's 25km/h.)
Highways signs
http://www.state.in...out_milemarker.html
similar [scothand, Dec 23 2004]
[link]
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Around me, the interstate system has small blue and reflective white signs on the side and middle of the road that mark every 0.1 or 0.2 mile. They aren't as frequent as you descibed, unless you're driving at 180mph, but it's similar. |
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