Stationary Crash Cushions in Work Zones, Explained

A temporary concrete barrier protects workers from traffic. The end of that barrier is a different story. An exposed end is itself something a driver can hit, which is the problem a stationary crash cushion exists to solve.

This post is a plain-language read of what the federal manual says about them, and what it means for how a traffic control company tracks them. It is not a design guide. Product selection and placement belong to the engineer and the agency.

What the MUTCD says

Section 6M.05 of the MUTCD 11th Edition, Part 6 defines crash cushions as systems that reduce the effects of errant vehicles striking obstacles, by slowing the vehicle to a stop in a head-on hit or by redirecting it. It names two types used in temporary traffic control zones: stationary crash cushions and truck-mounted attenuators.

For stationary units, the manual explains they are used the way they are in permanent highway installations, to protect drivers from exposed ends of barriers, fixed objects and other obstacles. It requires them to be designed for the specific application intended.

Two requirements apply to every crash cushion in a work zone. They must be crashworthy, and they must be periodically inspected to verify they have not been hit or damaged. Damaged units must be promptly repaired or replaced so that crashworthiness is maintained. The full text is in the official MUTCD 11th Edition resources; read it there rather than relying on a summary, including this one.

Stationary versus truck-mounted

A truck-mounted attenuator moves with the operation and protects a shadow vehicle. A stationary cushion stays put and protects a fixed hazard, usually a barrier end that has to remain in place for the life of a phase. If you need the mobile side, see truck-mounted attenuators, explained. For the barrier those cushions terminate, see temporary concrete barrier in work zones.

Why it is an inventory problem, not just a safety one

The manual's inspection and repair language has an operational consequence. A cushion that was hit is not simply a damaged asset. It may be a barrier end that is exposed again, on a live roadway, until someone replaces it.

For a company that owns or rents these units, a few things need to be knowable without a phone call:

• Where each unit is. Which job, which phase, which barrier end.
• When it was last inspected, and by whom. The manual says periodically, so your own written interval, set with your agency and the product manufacturer's instructions, is the practical answer.
• Whether it has been hit. And what happened next: repaired, replaced, or pulled from service.
• Whose it is. Owned, rented in, or rented out. A damaged rented unit becomes a billing conversation, which is why tracking damaged and lost rental equipment matters.

Photo evidence from setup and from each inspection helps all of it. See photo documentation of work zone setups.

What to ask the agency

Requirements differ by state, agency and contract, so treat the following as questions, not answers:

1. Does the contract or the plan name the crash cushion product or performance level required at each barrier end?
2. Does the agency keep an approved products list for work zone crash cushions, and how current must the unit's documentation be?
3. Who inspects after a hit, who is notified, and how fast must a damaged unit be repaired or replaced?
4. Is the cushion bid as its own item, or folded into barrier?

Verify all of this with the authority having jurisdiction before you place or price a unit. Nothing here substitutes for that.

A workflow that works in a yard

Most crash cushion problems are paperwork problems that show up late. A workable routine has four parts.

Before the job. Confirm from the plan or contract what the barrier ends require. If the plan calls for a cushion and you do not have the exact unit, find out early whether the agency accepts an equivalent, because a substitution found on the morning of setup is a delay and sometimes a lost shift. Check the unit's condition against the manufacturer's instructions before it leaves the yard, and photograph it loaded.

At setup. The crew lead records the unit, the location and the time, with a photo of the installed cushion and the barrier end it protects. This is the same discipline you apply to the rest of the setup, and it is what lets you answer, months later, whether the device was in place on a given day.

During the job. The inspection interval is yours to define with the agency and the manufacturer. Write it down, assign it to a named role, and record each inspection as a dated entry. After any reported strike, the unit gets flagged immediately. Do not let the crew "keep an eye on it" informally, because that is exactly the case where a hit unit stays in the line.

At teardown or after a hit. Record condition at pickup. If it was struck, note the date, who reported it, what was repaired or replaced, and who approved the unit to return to service. If the unit was rented in, that same record is your evidence in a damage discussion with the supplier. If it was rented out, it is your evidence with the customer.

Common mistakes

• Treating the cushion as part of the barrier line item. It is a separate device with its own condition, inspection record and replacement cost.
• No owner for inspection. "The crew checks it" means nobody does. Name the role.
• Reusing a unit without a record of its history. If you cannot say whether a unit has been struck, assume the question is open until someone inspects it.
• Verbal reports of a hit. A phone call that never reaches dispatch leaves a barrier end exposed while the next crew is scheduled around it.
• Pricing without the replacement scenario. If your agreement does not say who pays when a third-party vehicle destroys a cushion, you will negotiate it after the fact. Settle it in the master agreement; see master service agreements and rate sheets.

A caution on scope

This is general information about how the process works. Crashworthiness criteria, approved products and inspection obligations vary by state, agency and contract, and they change. The manual cited above is the federal baseline, and state manuals may add to it. Confirm the specifics for each job with the authority having jurisdiction, and with the cushion manufacturer for installation and repair.

Keeping it on the record

Traffic OS keeps equipment on a single asset record with job assignment and service history, so a hit unit shows up in dispatch instead of in a text thread. It is priced in flat monthly tiers rather than per user. See the features, the comparison with ServiceTitan, or bring your fleet to a walkthrough.