Half a croissant, on a plate, with a sign in front of it saying '50c'
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Relative Speed Indicator

When you're driving too slow/fast, it tells you.
  (+5, -2)
(+5, -2)
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Given that more and more electronics are present on roadways to indicate speed limits... Sensor equipped vehicle has info that speed limit is 65. Vehicle is doing 55. LED indicates -10 on Readout beside Actual Speed.

Sensor equipped vehicle has info that speed limit is 65. Vehicle is doing 75. LED indicates +10 on Readout beside Actual Speed.


Sometimes people are unaware of speed limits within different areas. Sometimes they are in their own little world. Sometimes they are old and in the way.

One can take note of road conditions, and adjust accordingly. The driver is in full control of vehicle, no speed governor overrides drivers action.

thumbwax, Oct 10 2001


       perhaps a beek-beek to draw their attention to the display too.
The_Englishman_Abroad, Oct 10 2001

       Fixes a non-problem.
jutta, Oct 10 2001, last modified Oct 11 2001

       My 1 minute of thought and a few minutes of typing show.
thumbwax, Oct 11 2001

       Of course, you could invent a group of people whose job is to go along roads and place large signs at each point the speed limit changes clearly indicating the new speed limit. Baked? Not where I live.
pottedstu, Oct 11 2001

       You can tell by the distance between the lamp-posts in the UK.
stupop, Oct 11 2001

       Oh, great. Another attempt to curtail speeding that will be totally ignored. Speaking as one who was rear-ended by some idiot driving 80+ mph in a 65 mph zone, how about a device that reaches out and slaps the sh*t out of driver when (s)he accelerates 5+ mph over posted speed limit...
kimsgems, Oct 11 2001

       Geez. Could you change this to a Relativistic Speed Indicator, with a readout showing the time dilation and Lorentz-Fitzgerald contraction for your current speed relative to the roadway? I mean I know it would be miniscule, but it would be interesting to know that your car was a millionth of a micron shorter at 110 kph than it was in the garage.
Dog Ed, Oct 11 2001

       Speed limits are reduced well in advance of residential areas to allow drivers time to slow down. If drivers need more reminders to slow down, a cheaper and simpler solution is additional signage.   

       However, if it could be implemented relatively cheaply (maybe the signs contain a cheap, passive speed limit indicator that is electronically read by the car), this might be a convenient feature, at least for luxury cars.   

       [kimsgems] Your alternative sh*t-slapping-out device would only ensure that you get rear-ended at 65 mph instead of 80+ mph. And it would greatly increase the number of crashes caused by loss of vehicle control, post-sh*t-slapping-out.
ConsultingDetective, Jan 31 2004


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