A cone that is too short gets missed at 40 miles an hour. A cone that is too tall costs more per unit than the job actually needs. Traffic cone size sounds like a small decision until it shows up on an inspection report or a shipping invoice.

The industry works off three practical heights: 18 inch, 28 inch, and 36 inch. Each one solves a different job. Picking whatever is cheapest or whatever showed up on the last order skips the variable that actually matters: where the cone stands and how fast traffic moves past it.

Here is what separates 18, 28, and 36 inch cones, where each one earns its place on a jobsite, a parking lot, or a roadway, and how to land on the right size before the order ships, not after the walkthrough.

Why Cone Size Is a Safety Call, Not a Guess

Cone height controls one thing above all else: how far away a driver or pedestrian sees it and reacts. A cone standing next to a warehouse aisle does not need to compete with headlights on a state road. A cone marking a lane closure at 45 miles an hour does.

Most state DOT specs set a minimum height for roadway work, and many require the taller cone on higher speed corridors or after dark. Undersizing a work zone is the kind of thing that fails an inspection fast. Oversizing an indoor job just eats storage space and budget for no safety gain. The right call depends on the site, not the catalog page.

18, 28, and 36 Inch Cones: What Each Size Actually Does

• 18 Inch Safety Cones handle low speed, low visibility jobs: warehouse aisles, retail floors, indoor walkways, wet floor marking, and short duration setups where traffic is on foot, not in cars.
• 28 Inch Safety Cones are the default for most outdoor jobs: parking lots, loading docks, general construction sites, and low speed roads. This is the size crews reach for first because it covers the widest range of use cases without over-ordering.
• 36 Inch Safety Cones are built for higher speed roadways, nighttime work, and DOT-spec lane closures where maximum visibility distance is not optional. When the job is next to moving traffic at highway speeds, this is the size that keeps a crew safe and a site compliant.

Matching Cone Size to the Job

Four checks before the order goes out:

1. Check the posted speed limit or the actual traffic flow at the site. Faster traffic needs a taller, more visible cone.
2. Check the state or local DOT spec for the job type. Roadway and lane closure work often carries a minimum height requirement.
3. Separate indoor from outdoor use. Indoor aisles and retail floors rarely need anything past 18 inch.
4. When the shift runs into low light or the site is unfamiliar, size up. A 36 inch cone costs more per unit than an 18 inch one, but not nearly as much as a redo after a failed inspection.

One Job, The Right Cone Every Time

Traffic Cones For Less stocks 18, 28, and 36 inch safety cones ready to ship, with clear pricing and no surprise fees at checkout. Pick the size the job actually calls for, order it once, and get back to work.

Get the right cone size for your site from Traffic Cones For Less.