G'morning Heather, 

 HL> I'd prefer gates that stand upright until a car goes through them the
 HL> wrong way... and they crash down on the offending cars roof.
 HL> 

Mmmm - you'd appreciate my adaptation of the Korean War's pangi 
pit ... a wrong entry releases the trapdoors temporarily, dropping 
the offending car 20 feet onto a lovely set of steel spikes ...

The Board have ruled them out of court, too, and asked that the 
pit be filled again with regard for the environment...

Sadly, I find that nobody has much of that, either,  these days...

:-))
 
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