Temporary Concrete Barrier in Work Zones: What the MUTCD Says and What Crews Should Know

Most of what a traffic control crew puts on the road is a warning: signs, cones, drums, arrow boards. Temporary traffic barrier is different. It is a physical thing a vehicle can hit, designed so that the hit does less harm than it would without it.

Barrier is usually installed by a different crew, often by another contractor, and your company may only specify, rent or work behind it. That is exactly why traffic control managers should understand what the national manual says about it. This is a plain-language paraphrase of the MUTCD 11th Edition, not a substitute for it, and your agency's contract, state manual and approved plan control. Verify with the authority having jurisdiction.

What the manual says barrier is

Section 6M.02 of the MUTCD 11th Edition, in the Part 6 PDF, describes temporary traffic barriers, including portable or movable ones, as devices designed to help prevent penetration by vehicles while minimizing injuries to occupants, and to protect workers, bicyclists and pedestrians. The section says temporary barrier includes portable concrete, portable steel or movable barrier that can be moved from site to site, and it points to the AASHTO Roadside Design Guide for more specific information.

Two consequences matter operationally. First, barrier is not the same product as a channelizing device. Second, the manual requires temporary barrier and its end treatments to be crashworthy, so what you place matters as much as that you placed something.

When the manual says to consider it

The guidance in the section is that longitudinal barrier and other positive protection should be considered in work zone situations that place workers at increased risk from motorized traffic. The manual's listed considerations, paraphrased:

• Work zones where workers have no means of escape from motorized traffic, such as tunnels or bridges.
• Long-term stationary work zones of two weeks or more that create substantial worker exposure.
• Projects with anticipated operating speeds of 45 mph or greater, especially with high volumes.
• Work that places workers, pedestrians or bicyclists close to open travel lanes.
• Roadside hazards, such as drop-offs or unfinished bridge decks, that will remain overnight or longer.

The manual also notes that 23 CFR 630.1108(a) has additional requirements for certain projects. These are considerations, not a universal rule. Whether barrier is required on a specific job is a question for the contract documents and the agency. Our explainer on positive protection goes through how this plays out in practice.

The requirements crews actually run into

Section 6M.02 contains standard-level statements that are worth knowing by heart:

• Temporary barriers, including their end treatments, shall be crashworthy.
• Adjacent segments shall be properly connected so the barrier has the strength it needs to perform.
• Short intermittent segments shall not be used. The manual's reasoning is that they nullify containment and redirection, raise injury potential, and encourage blunt leading ends.
• If barrier is used to channelize vehicular traffic, it shall be supplemented with delineation, pavement markings or channelizing devices for daytime and nighttime visibility, and the delineation color shall match the applicable pavement marking color.
• Steady-burn warning lights may be mounted on barrier installations.

Barrier as a channelizing line, and its limits

Section 6K.09 covers temporary barrier used as a channelizing device. The manual says barrier is not a TTC device by itself, but becomes one when placed in the position of a line of channelizing devices and marked or equipped to guide road users day and night. It then has to comply with Part 6 requirements for those devices.

The same section says barrier shall not be used solely to channelize road users but also to protect the work space. For tapers, the guidance is that barrier should not be used for a merging taper except in low-speed urban areas. Where it is necessary, the taper shall be delineated with channelizing devices, an edge line or delineators on the barrier, and when used for channelization the barrier should be a light color for visibility. For the geometry of tapers, see our taper length and buffer space explainer.

What this means for a traffic control company

On a bid. If the plan puts barrier on the job, find out who furnishes, installs and moves it, and whether delineation, warning lights and end treatments are in your scope or someone else's. Our post on exclusions and assumptions in proposals shows how to write that down.

In the field. Barrier changes what your flaggers and setup crew can safely do. Staging behind it is a different job than staging on an open shoulder, and the end of the barrier run is where the exposure sits. Cover it in the tailgate meeting.

On inspection. Look at the connections, the end treatments and the delineation, because these are the details an inspector will check first and the ones that fail without anyone noticing.

Keep barrier on the record

Barrier is long-lived equipment that is moved between phases and jobs, often rented, and often disputed at pickup. Record the quantity, the location, who placed it and when it moved, in the same system that holds the job. Traffic OS handles multi-yard inventory and equipment tracking, with plans that include every feature, and a demo shows how a job's equipment list works.

The takeaway

Barrier is protection, not decoration. The national manual asks that it be crashworthy, connected, delineated and not used in tiny pieces. If your job involves it, learn who owns each of those obligations before the first day.