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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
in the same category and an HB classic. Covering roughly the same territory. [calum, Mar 16 2007]
put them to work, I say.
[po, Mar 17 2007]
||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.
||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?
||Good idea, though air is no substitute for
||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.