In message <[email protected]>, 
dated Mon, 19 Apr 2010, [email protected] writes:

>It's not reasonable to have 100% safe equipment, but there at least 
>should be some type of failsafe exit mode.

An emergency fuel cut-off, an actual mechanical valve, would seem to do 
the necessary for vehicles, and the cost would be low. In most 
countries, I think, diesel-engined buses have such a device.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
I should be disillusioned, but it's not worth the effort.

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