On 9/20/10 5:35 PM, John Smith wrote:
What about water filled plastic barriers?
http://www.made-in-china.com/showroom/resourcesint/product-detailzqMJlfFDaQGv/China-Water-Filled-Plastic-Barrier.html
They may not be permanent, but some stay in place for long periods of time.
these are a variant on the "Fitch Barrier":
http://en.wikipedia.org/wiki/Impact_attenuator#Fitch_Barrier
Fitch barriers are often really permanent, they get used at the points
where ramps separate to protect drivers who blow the decision
on which ramp to take.
richard
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