Or possibly, so close to a road.....similar to the rr track guideline.
Re common sense, I shall quote my dearly departed Mamgi (grandmother): "Common sense ain't."
The problem isn't the guardrail hides, per se, or even "close to a road", but caches placed in guardrails and/or on signs... or whereever - in locations where it's not legal to stop or park except in emergencies.
There's a local cache here that just makes me cringe... it's on or near a sign that's in the middle of a 4-lane highway, at a spot where there's a gap to allow vehicles to cross to the far side. The ONLY way to access it is to be IN THE BLANKETY-BLANK TRAFFIC LANE... whether on foot or in a car, no way in hell should anybody be there. Yet not only did someone put a cache there, but people are parking their cars, getting out, and standing on the cars to reach the cache. It's only a matter of time until a State Trooper or County Mountie sees this, and/or somebody causes an accident.
I've really been debating whether to contact the local reviewer about it.