Why do some of curviest, low dropoff parts of a road have no guardrail? And why are guardrails intermittent on roads?
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I live in AZ. Sometimes there isn’t a good place to mount a guardrail. Let’s say you’re talking about a twisty mountain road that’s been carved into the rock. There may not have been enough space to make the cut wide enough for the minimum lane width plus the extra space for the guardrail. I’ve seen them mounted in the rock on the side but not all rock is created equal. Some of it isn’t suitable for drilling into. You really wouldn’t want to have someone hit the rail and then have the roadway crumble and take more cars with it.
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