What Are Crash Cushions?
A crash cushion, also called an attenuator, is a protective device designed to absorb energy and slow a vehicle that strikes it. It shields workers and equipment from fixed hazards or the leading edge of a work area. Crash cushions can be fixed in place or mounted on a truck to protect mobile or short-duration operations.
Last updated: June 24, 2026
Why It Matters
A crash cushion can reduce the severity of an impact at a hard point or at the start of a work area. It is used where a vehicle could otherwise strike a hazard directly.
Truck-mounted attenuators allow protection to move with certain operations, which is useful for ongoing work.
Where It Shows Up in the Field
Crash cushions appear at the leading edge of barriers, at fixed hazards, and behind mobile operations, including on freeway work common in Southern California.
In the field, the cushion is positioned to take an impact before it reaches the people it protects.
Common Mistakes
- Omitting protection at a hard point or exposed work area edge.
- Positioning the cushion so it does not actually shield the hazard.
- Using the wrong type for the speed or situation.
- Not following the plan for where attenuators are required.
What to Check Before Work Begins
- Whether the work area edge or hazard needs an attenuator.
- That the cushion is positioned to protect the work.
- That the type matches the speed and conditions.
- That placement matches the approved plan.
Related Terms
Related Pages
Frequently Asked Questions
What is a crash cushion?
A crash cushion, or attenuator, absorbs energy and slows a vehicle that strikes it, shielding workers and equipment from a fixed hazard or the leading edge of a work area.
What is a truck-mounted attenuator?
It is a crash cushion mounted on a truck so protection can move with mobile or short-duration operations.
Where are crash cushions placed?
At the leading edge of barriers, at fixed hazards, or behind mobile operations, positioned to take an impact before it reaches the people they protect.
Need Project-Specific Support?
Work Zone Compliance provides general educational information about work zone compliance. For project-specific traffic control plan support, permit coordination, or public right-of-way planning in Southern California, visit Public Ready.
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