Crash attenuator systems are an important part of traffic control in work zones where vehicles may be exposed to fixed objects, barriers, lane transitions, or other hazards.

Construction projects can change the normal path of traffic. Lanes may become narrower, traffic may shift, and drivers may need to travel closer to construction equipment and temporary structures. In these situations, additional protection may be required at specific locations within the work zone.

A crash attenuator can help manage the risk associated with certain impact points by providing a designated energy-absorbing system between approaching vehicles and a protected hazard.

For highway construction, road rehabilitation, infrastructure projects, and other high-risk work zones, the right crash attenuator system can be an important component of a broader traffic control and Traffic Management strategy.

A crash attenuator is a safety device designed to absorb and manage the energy of a vehicle impact.

Crash attenuators are commonly positioned in front of certain fixed hazards or at locations where a vehicle could otherwise directly impact a barrier or other obstruction.

The system is designed to help reduce the severity of an impact by absorbing some of the vehicle's kinetic energy.

A crash attenuator is not simply another type of traffic barrier. It has a specific role within a work-zone protection system.

Its placement, configuration, and performance depend on the roadway, traffic conditions, hazard being protected, and the requirements of the specific project.

Road construction can create hazards that do not normally exist on an open roadway.

Temporary barriers, lane shifts, bridge structures, equipment, and other fixed objects can be positioned closer to moving traffic than they would be under normal conditions.

A driver who loses control or fails to follow a temporary traffic pattern could potentially encounter one of these hazards.

A crash attenuator can provide an additional layer of protection at certain locations.

It can help separate an approaching vehicle from a fixed hazard and is designed to manage the energy of a vehicle impact.

This makes crash attenuators particularly relevant to work zones where traffic travels close to barriers or other protected objects.

The correct application depends on the project design and the specific system being used.

Crash attenuators may be found in applications such as:

1. Highway construction

2. Road reconstruction

3. Bridge construction and rehabilitation

4. Lane shifts

5. Temporary traffic configurations

6. Barrier ends

7. Gore areas

8. Roadside hazards

9. Infrastructure projects

10. Long-term work zones

They are especially relevant where a temporary traffic arrangement creates an exposed hazard that requires additional impact protection.

Crash attenuators and concrete barriers serve different purposes, but they can work together.

A concrete barrier can create physical separation between moving traffic and an active work area. It may be used to define a temporary lane or protect workers and equipment.

However, the end of a barrier can present a different type of hazard.

A crash attenuator may be installed at an appropriate barrier end to provide an energy-absorbing transition between approaching traffic and the barrier.

This is why crash attenuators are often considered as part of the overall barrier and work-zone protection system rather than as an independent piece of equipment.

Lane shifts are common during road construction.

When traffic moves from its normal path into a temporary lane, the roadway geometry changes. Drivers may encounter narrower lanes, curves, temporary markings, barriers, and other traffic control devices.

A crash attenuator may be appropriate at certain locations within this temporary configuration.

The exact location depends on the work-zone design and the hazards present.

Proper advance warning is also important. Drivers need to understand the upcoming change in roadway conditions before reaching the temporary traffic arrangement.

This is why crash attenuators should be incorporated into the overall traffic control plan rather than added independently after the traffic pattern has already been established.

Barrier ends require careful consideration in work-zone planning.

A vehicle approaching the end of a barrier can encounter a concentrated point of impact. Depending on the roadway configuration and project requirements, a crash attenuator may be used to provide an impact-absorbing transition.

The attenuator must be compatible with the barrier and the intended application.

The system should also be installed according to the applicable product requirements and project specifications.

Highway construction presents unique traffic control challenges.

Vehicles may travel at higher speeds, traffic volumes can be significant, and work areas may extend over long distances.

A temporary lane configuration may place traffic closer to construction barriers or other hazards.

For these projects, crash attenuators can be one component of a larger work-zone protection system.

The overall setup may also include:

• Advance warning signs
• Traffic drums
• Traffic cones
• Barricades
• Concrete barriers
• Pavement markings
• Lane transitions
• Portable message signs
• Other traffic control devices

Each component needs to work together to communicate the temporary roadway configuration and manage traffic through the work area.

Traffic control involves much more than placing signs around a construction site.

A complete traffic control setup considers how vehicles enter the work zone, how they move through it, where they transition between lanes, and how workers and equipment are separated from traffic.

Crash attenuators fit into this system by addressing specific impact hazards.

They do not replace signs, pavement markings, barriers, or channelizing devices.

Instead, they can complement these measures where additional impact protection is required.

Traffic Management takes an even broader view of how a construction project affects road users.

It can involve planning traffic stages, coordinating construction activities, managing lane closures, establishing detours, maintaining access, and adjusting traffic patterns as a project progresses.

A crash attenuator may be needed during one phase but not another.

For example, a project may begin with work on the shoulder. Later, traffic may shift into a temporary lane while crews work closer to the centre of the roadway. The barrier configuration and associated protection measures may change as a result.

This is why crash attenuator requirements should be reviewed whenever the traffic configuration changes.

There is no single crash attenuator setup that works for every project.

Several factors need to be considered.

Traffic Speed

The speed of approaching vehicles is an important consideration when selecting and designing a work-zone protection system.

Higher-speed roadways can require different protection strategies than low-speed urban roads.

Roadway Layout

The shape and geometry of the roadway can affect where hazards occur.

Curves, merges, lane shifts, intersections, ramps, and narrow sections can all create different traffic control conditions.

Fixed Hazards

The location and type of hazard being protected should be evaluated.

This could include a temporary concrete barrier, bridge structure, roadside object, or another fixed obstruction.

Traffic Volume

A road carrying a large volume of vehicles may require a different traffic control approach than a low-volume roadway.

Traffic patterns and potential queues should also be considered.

Construction Phase

The work zone may change as construction progresses.

A crash attenuator that is appropriate during one stage may need to be relocated, removed, or replaced when traffic moves into another configuration.

Applicable Requirements

Crash attenuator systems should be selected and installed according to the applicable project specifications, manufacturer requirements, and relevant roadway safety requirements.

Choosing a crash attenuator should involve more than selecting a product based on appearance or size.

The system needs to be appropriate for its intended application.

Important considerations can include:

• The type of hazard being protected
• Traffic speed
• Roadway configuration
• Available space
• Barrier type
• Project duration
• Expected impact conditions
• Installation requirements
• Maintenance requirements
• Applicable specifications and standards

The product's technical documentation should be reviewed before installation.

Where required, qualified traffic control or engineering professionals should determine the appropriate system for the project.

Crash Attenuators and Temporary Traffic Barriers

Temporary traffic barriers can provide physical separation between vehicles and construction activities.

They are commonly used for projects that require a stronger boundary than traffic cones or drums can provide.

However, barriers themselves need to be considered as part of a complete system.

Where a barrier creates an exposed end or other potential impact point, a crash attenuator may be incorporated into the design where appropriate.

This creates a relationship between the barrier system and the impact protection system.

The two should therefore be planned together.

Not every roadside hazard requires a crash attenuator.

However, certain roadside conditions can create significant consequences if a vehicle leaves its intended travel path.

During construction, the normal roadside environment can also change.

Equipment, temporary barriers, structures, and other objects may be introduced into areas that were previously clear.

A traffic control assessment can identify locations where additional protection may be required.

Crash attenuators can then be considered as one part of the overall roadside protection strategy.

Installing a crash attenuator is not the end of the process.

Work zones experience constant movement.

Vehicles may strike or move traffic control devices. Construction crews may need to modify the roadway. Barriers may be repositioned. Weather can also affect the condition of equipment.

Crash attenuator systems should therefore be inspected according to the applicable requirements.

After an impact, the system should be assessed before being placed back into service.

Damage that is not immediately obvious can affect the performance of the system.

Regular work-zone inspections can help identify changes that need to be addressed.

Large construction projects often involve several traffic configurations.

For example:

Phase 1: Shoulder work

Traffic remains in the existing lanes while crews work outside the main travel area.

Phase 2: Lane closure

One lane is closed and traffic moves through a reduced roadway.

Phase 3: Traffic shift

Traffic moves into temporary lanes while construction takes place within the original roadway.

Phase 4: Opposite-side construction

Traffic is moved again as crews begin work on another section.

Phase 5: Final roadway work

Temporary barriers and other traffic control equipment are gradually removed as the permanent roadway is restored.

Each phase can introduce different hazards.

Crash attenuator requirements should therefore be reviewed as part of each major traffic control change.

Crash attenuators are specialized traffic safety equipment.

Their effectiveness depends on using the appropriate system for the application and installing it correctly.

A work-zone plan should consider the entire traffic environment rather than focusing on one product.

Signs need to warn drivers. Channelizing devices need to guide them. Barriers need to establish separation. Crash attenuators may provide impact protection at designated locations.

When these elements are planned together, they can create a more consistent traffic control system.

Construction and infrastructure projects throughout Ontario can involve changing lanes, temporary barriers, road closures, traffic shifts, and other challenging traffic conditions.

The right traffic control equipment can help contractors establish and maintain these temporary configurations.

Barricade Traffic Services provides traffic control equipment and solutions for construction, infrastructure, road work, and other projects throughout Ontario.

If your project requires crash attenuators, concrete barriers, barricades, traffic signs, or other traffic control equipment, our team can help you identify the equipment needed for your work-zone setup.

Contact Barricade Traffic Services to discuss your project and traffic control requirements.