Since this is a road forum, I am curious to know how often people see "Severe Tire Damage" spike barriers (the things that shred your tires if you go the wrong way into or out of someplace). I know they are still used almost universally at airport rental car lots, but I don't see them very often in places outside of that.
I know they are common (or at least once were fairly common) on the west coast (particularly in California, I see them fairly often when I'm out there), but outside of there, I only see them occasionally elsewhere in the country. Since they seem to be common in California, I wonder if it was once a rule there that they had to be installed in certain situations?
Where do you see Severe Tire Damage spike barriers, if you do at all?