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Make the speed-control ramps (oldies -- read 'sleeping policeman') out of a very thick BUT HOLLOW semi-rigid rubber. There is a hole in the rubber to the hollow bit (filled with air) - so the speed ramp normally holds its shape though its bendible rigidity (if that makes sense - Imagine if you crush
a plastic bottle slightly and then let go .. it reinflates back to its original shape).
The hole is precisely machined so that if a car passes over it at 30mph or less -- the air can fly out of the whole ramp-- so the speed ramp under the weight of the car simple collapses to flat and the law-abiding citizen doesn't suffer a bumpy ride. Naturally it re-inflates itself once the car is past like your slightly squashed plastic bottle reinflates itself when you let go.
A car goes speeding past at an illegal 50mph -- the air doesn't escape quick enough -- the car suffers the speedramp in full effect.
Law abiding citizens no longer have to suffer the grief of lumpy speedramps - speeders still slow down for them! This could work for different speed zones, with different sized 'air holes'.
Custard Filled Speed Bumps
Custard-Filled_20Speed_20Bumps
in the same category and an HB classic. Covering roughly the same territory. [calum, Mar 16 2007]
put them to work, I say.
road-hump_20wine_20press
[po, Mar 17 2007]
[link]
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Just so long as it deflates sensibly, and doesn't wiggle or anything. Or you'll have a queue of cyclists and motorcyclists at your door to beat you up. |
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You'd also need to solve the problem of different wheel-loading on different vehicles. A Smart Car might not deflate it properly, but a bus might burst it? |
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Good idea, though air is no substitute for
custard. |
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One request. Does anyone know the name
for those whistles which have a spinning
thing in them, so that when you blow them
they rise in pitch a bit like a tiny buzzy
engine revving? Whatever they are called, I
want them fitted on this thing's blowhole. |
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