They think protecting drivers cars from scratches is more important than protecting pedestrians from getting hit, so they make the sidewalk part of the "clear zone"
Physical design is not neutral.
Physical design is an expression of our values.
this post was submitted on 16 Jul 2025
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In this case, and I'm guessing in many cases like it, it looks like the rail's there to prevent the vehicle from driving into a ditch or other obstacle.
This is the correct answer. Guard rails are to prevent vehicles from going down steep embankments or other hazards. They can be used for separating traffic from walkways, but I don't think there's been any studies into the efficacy of doing so.
The guardrail can serve the don't-drive-off-embankment function equally well positioned before the sidewalk. The problem is when an out-of-control car strikes the guardrail at a glancing angle, it takes a long time (by design) to grind down to a stop. This creates a bowling alley effect. The guardrail keeps the speedy car centered right on the sidewalk. Any human bowling pins are toast. Some of the most horrific traffic death videos I've seen involve that. Whole families wiped out.