Short answer: most well-maintained street benches should not have sharp edges that catch clothing or skin, but it absolutely can happen. I have sat on enough public benches to know that not all of them age gracefully. A smooth bench on day one can become a coat-snagging nuisance after a few seasons of weather, wear, and rough use.
Modern street furniture is usually designed with rounded or rolled edges, especially on metal slats, armrests, and backrests. Powder-coated steel, cast aluminum, and recycled plastic benches typically have smooth profiles when they are new. Manufacturers know that public seating gets heavy use, so they try to eliminate sharp corners and exposed fasteners. In most cases, a properly installed and undamaged bench is safe to sit on without worrying about your clothes or skin.
However, sharp edges do appear over time. Worn powder coating can flake away and expose raw metal edges. A bent armrest or seat slat from vandalism or a minor collision can leave a corner that catches jackets or scrapes skin. Loose bolts, missing end caps, or damaged hardware can create protruding metal that is easy to overlook. Wooden benches are especially prone to splintering or cracking, particularly around knots, fasteners, or areas where water collects. Rust can also eat away at welded joints and leave jagged edges behind.
If you are checking a specific bench, start by looking, not touching. Run your eyes along the seat edges, armrests, backrest corners, and anywhere the bench meets the frame. Pay attention to gaps between slats and the metal support underneath. If something looks suspicious, run your hand slowly about half an inch above the surface first, then lightly touch the area. A sharp edge will usually feel like a burr, a raised splinter, or a rough metal lip. Be careful, because a damaged bench can cut skin before you realize it.
If you do find a sharp edge, the practical step is to report it. Note the location, take a photo if possible, and contact the local parks department, property manager, or city maintenance line. Most public agencies would rather repair or replace a bench than deal with an injury complaint. Until it is fixed, choose another spot or sit on a folded jacket to protect your clothing.
So yes, sharp edges can exist on street benches, but they are usually a sign of damage, aging, or poor maintenance rather than intentional design. A quick visual check before you sit can save your favorite coat from a tear and your skin from an unexpected scratch.