I wonder what you can hang from that bracket?
Hanging basket? Punchbag? Wind chimes? Church bell? Inflatable chicken?
Something that is visible to the driver, and that a car can hit without doing damage
It's a barrier that I want, rather than a deterrent/guide. Have been googling "pipe protectors" as recommended, but haven't found anything the right size yet - ideally I want something that doesn't protrude much more than 10cm from the wall
I have an IR beam, across my garage roller door, I drive in, nose first. To that, I added an LED wired, to the back of the garage. It lights up, when the rear of the car, is just clear of the roller door.
The OP, could similarly, wire an IR beam lined up at an angle between that corner at the side of the door, with the reflector, on that adjacent wall to the left.
You could knock something up with key clamp?
Loads of places will cut the tube as part of the mail order, you only need to assemble with an Allen key.
Square or round galvanised, some is powder coated.
To be honest, you could use glue fit poly plumbing pipe and fittings, although less robust
Fit a PIR Rechargable LED light to come on when near
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