A reflective traffic cone is only legal for nighttime road work if it has two ASTM Type IV (or better) collars at the right heights. For a 28" cone, that means a 6" collar starting 3–4" from the top and a 4" collar starting 2" below the first. For a 36" cone, both collars are 6" wide. Anything narrower, anything in Engineer Grade sheeting, anything with a single collar — fails MUTCD §6F.65 the moment a state or municipal inspector looks. Below: the sheeting grades that matter, the collar geometry, what to expect to spend, and the cones we actually stock for NJ contractors.
Why reflectivity matters more than people think
Headlights at night put about 40 candela of light onto a cone 200 ft away. A non-reflective cone returns essentially zero of that light back to the driver — the cone is invisible until the headlight beam itself lights its surface, which happens at roughly 100 ft. At 50 mph, 100 ft is 1.4 seconds of reaction distance. That is not enough.
A cone with two Type IV reflective collars returns about 250 candela per lux from each collar surface — the cone is visible at 800–1,000 ft, which gives the driver 11+ seconds at 50 mph. Same cone, same position, same headlights — the difference is one $4 sheeting upgrade per cone.
ASTM sheeting types — the only spec that matters
Reflective sheeting on a cone follows ASTM D4956. Five types show up in catalogs; only three are real options:
| ASTM type | Common name | Brightness (cd/lx) | Acceptable use |
|---|---|---|---|
| Type I | Engineer Grade | ~70 | Daytime channelizing only — NOT for nighttime road work |
| Type III | High-Intensity Beaded | ~250 | Acceptable in some states; being phased out |
| Type IV | High-Intensity Prismatic | ~250 | MUTCD nighttime minimum — buy this by default |
| Type IX | Very-High-Intensity Prismatic | ~500 | Higher-speed roadways, weather hardship |
| Type XI | Diamond Grade | ~700+ | Freeway-level deployment, premium price |
For practical NJ contractor purposes, Type IV is the right answer 95% of the time. Type III still ships in older inventory; Type IX/XI is overkill for a municipal cone that will be on the road for an afternoon.
Collar geometry — the spec that fails inspections
MUTCD §6F.65 specifies collar widths and positions by cone height:
- 28" cones (low-speed roads): One 6" collar starting 3–4" from the top, plus one 4" collar starting 2" below the first.
- 36" cones (high-speed and nighttime): One 6" collar starting 3–4" from the top, plus one 4" collar starting 2" below the first. Some specs require a third reflective stripe lower down.
- 42" channelizer drums: Four collars (two 4" white over two 4" orange), alternating, covering the upper two-thirds of the drum.
Cheap import cones often ship with a single 3" collar — visually similar at 10 ft, fails the moment the inspector measures it. If a quote line item does not specify collar width, ask. The collar spec is what separates a "cone" from an MUTCD-compliant channelizing device.
What "retroreflective" actually means
Retroreflective sheeting bounces light back along the path it came from — so a vehicle's headlight returns light to that same vehicle's driver, not to a pedestrian standing off to the side. The mechanism is either glass beads (Types I–III) or microprismatic cube corners (Types IV+). Prismatic types are brighter, more durable, and more expensive.
A reflective collar is good for about 5–7 years of UV exposure before brightness degrades below acceptable. Cones in active fleet rotation should be inspected annually — fade and dirt are gradual. A quick gut check: shine a flashlight at the collar from 30 ft. If the return is clearly dimmer than a known-fresh cone, retire it from nighttime use.
Pricing — what a real reflective cone costs
For 28" cones with a 7-lb rubber base and double Type IV collars: $20–$32 each in case quantities. For 36" cones with a 10–12 lb base and double 6" collars: $35–$60. Single-collar Engineer Grade cones run $9–$15 — they have a place (parking-lot daytime use) but cannot legally back a road work zone after dark.
Custom-stenciled reflective cones (company name, phone) add roughly $4–$8 per cone over base pricing. Worth it on owned fleet because cones in plain orange disappear from job sites at a rate that surprises new contractors.
Common buying mistakes
- Buying by photo, not spec sheet. Two cones look identical in product photos; one has Engineer Grade sheeting and one has Type IV. Always demand the ASTM spec.
- Single-collar cones for road work. MUTCD requires two collars for any cone used on a road, day or night. Single-collar cones are for warehouse / parking-lot use.
- Reflective tape "added later" to non-reflective cones. The bond fails inside one cleaning cycle. Buy molded-collar cones from the factory.
- Buying short cones for fast roads. A 28" cone, no matter how reflective, is below windshield-line for many vehicles at 45+ mph. Step up to 36" for higher speeds.
How many reflective cones do you need
For most NJ contractor work, plan a baseline kit:
- 24× 28" Type IV double-collar cones (workhorse fleet)
- 12× 36" Type IV double-collar cones (high-speed and nighttime jobs)
- 6× 18" cones with single collar for parking-lot setups
- A spare 6-pack of each size for damaged-cone replacement
For a sizing calculation by job, see How Many Cones Do You Actually Need for a Lane Closure.
Where to buy in Central NJ
Browse our cones, drums, and channelizers for Type IV and Type IX sheeting, double-collar geometry, and rubber-base or recycled-rubber base options. Custom stenciling available. To match the right cones to a specific scope of work, request a quote — same-day Central NJ delivery on standard sizes.
Not sure what counts as "nighttime" for your job? The site assistant will read your job description and return the cone spec the inspector will look for.