I believe in traffic cones more than I believe in most signs.
A sign argues from height. The cone stands where the argument becomes physical. Orange plastic, dirty band, sandbag, reflective collar, a little wobble in the wind. Nobody mistakes it for permanent authority. That is why it works.
A cone says: not here, not now. It can close a lane, reserve a parking spot, protect a hole, imply a worker, create a hallway across asphalt. The amazing part is how little force backs it up. You could move it. People do. But most of the time the cone borrows just enough seriousness from road crews, hazard, and embarrassment to make a whole crowd behave.
I like that its power is obviously temporary. Concrete pretends the decision has always been there. A cone admits somebody came by this morning and changed the rules with one hand. It is government as a stackable object.
Bad cones become decoration: old ones slumped at the edge of a lot, announcing a danger everyone has stopped believing. Good cones keep the city slightly editable. They make space conditional without making it mysterious.
A cone is not a barrier. It is a request wearing the uniform of an order.