Temporary Safety Guardrails: Why It Matters

At road work sites, the temporary guardrail isn't just "another item on the equipment list" - it's the last line of defense between workers in the field and vehicles traveling alongside them at speeds of 60 to 110 km/h. A properly installed guardrail can save lives. An improperly installed one may be more dangerous than no guardrail at all.

In Israel, where many work sites operate adjacent to active traffic lanes, professional understanding of guardrail types, their performance levels, and installation requirements is fundamental knowledge that every traffic safety consultant must master.

The Interministerial Committee for Traffic and Safety Devices

Every safety guardrail installed on Israeli roads must be approved by the Interministerial Committee for Traffic and Safety Devices, which operates under the appointment of the Director General of the Ministry of Transport and Road Safety. The committee comprises representatives from the Ministry of Transport, Netivei Israel, Cross Israel Highway, Netivei Ayalon, Israel Police, Israel Railways, the Ministry of Defense, local authorities, and professional consultants.

The committee publishes an annual comprehensive booklet - "Approved Traffic, Safety and Signal Devices for Road Installation" - which serves as the official and binding source for all permitted devices. The latest edition (twenty-four) was published in January 2025, with a quarterly update in July 2025.

It is important to understand: no safety guardrail may be installed on Israeli roads without committee approval. This is a fundamental principle that safety consultants must enforce.

Guardrail Classification: Permanent vs. Mobile

The Interministerial Committee classifies safety guardrails into two main categories: permanent and mobile. The term "temporary" was previously used, but in recent years, following European trends, the terminology shifted to "mobile" - since some of these guardrails are also tested in examinations intended for permanent guardrails and can serve in final road design as well.

The essential difference: permanent guardrails are anchored in the ground through driving or bolting to concrete. Mobile guardrails are placed on the road surface (asphalt or concrete) without permanent fixation, allowing them to be moved between different work phases.

Performance Levels - What the Numbers Mean

Every safety guardrail is tested and classified according to the European standard EN 1317, adopted in Israel. Performance levels define the guardrail's ability to stop a vehicle that impacts it, measured through controlled crash tests.

The main performance levels for permanent guardrails are N2 (tested with a 1.5-ton passenger vehicle at 110 km/h at 20 degrees), H1 (additional test with a 10-ton truck at 70 km/h), H2 (13-ton bus at 70 km/h), and H4 (38-ton heavy truck at 65 km/h). For mobile guardrails, performance levels are designated with the letter T and a number, with T3 being the most common at work sites.

In addition to performance level, each guardrail is characterized by its Working Width (W) - the maximum distance the guardrail deflects during impact. This value is critical for planning: it defines the minimum required distance between the guardrail and the work zone or any rigid obstacle behind it.

Additional Parameters Every Consultant Must Know

Beyond performance level and working width, there are additional important parameters affecting the selection of the appropriate guardrail.

Minimum Tested Length - Each guardrail has a minimum length determined during testing, below which it will not perform as required. Installing a guardrail shorter than its minimum tested length is a serious error that compromises its absorption capability.

Acceleration Severity Index (ASI) - A measure indicating the severity of shock experienced by vehicle occupants during impact. Level A is the best (most "forgiving" to passengers), level B is moderate, and level C is the harshest. When possible, guardrails with lower ASI should be preferred.

Vehicle Intrusion (VI) - The distance the front of the vehicle penetrates beyond the rear face of the guardrail. This parameter is especially important when workers or equipment are behind the guardrail.

End Terminals and Energy Absorbers - The Detail That Saves Lives

A safety guardrail without proper end terminals at its beginning and end is a hazard in itself. An exposed end of a steel guardrail can penetrate into a vehicle that impacts it head-on - a fatal scenario.

Therefore, every guardrail system must have approved end terminals or energy absorbers installed. These too are tested and approved by the Interministerial Committee. A proper energy absorber "folds" the guardrail during a frontal impact, preventing penetration into the passenger compartment.

This is one of the most common findings in inspections: guardrails installed without energy absorbers, with absorbers of a type not compatible with the guardrail, or with absorbers that were improperly installed.

Key Installation Rules

Installing safety guardrails at a work site is not a matter of "place and hope for the best." There are precise rules that must be followed.

Plan Compliance - Guardrails shall be installed only in accordance with the approved traffic management plan. Any deviation requires approval from the planning authority.

Continuity - Guardrails must be connected continuously. A gap between guardrail sections allows a vehicle to penetrate the work zone and nullifies the entire system's function.

Anchoring - Mobile guardrails must be connected to each other and anchored according to manufacturer instructions. Loose connections reduce the system's absorption capability.

Reflectors - Reflectors must be installed along the guardrail in the direction of travel, at the frequency and height specified in the plan. During night inspections, these are the items that distinguish a visible guardrail from an "invisible" one.

Distance from Traffic - The guardrail must be positioned at sufficient distance from the traffic lane, according to the plan and its working width. A guardrail too close to the travel lane may be struck by routine traffic.

Common Field Mistakes

From experience in numerous work site inspections, these are the mistakes that keep recurring.

Using Unapproved Guardrails - Guardrails not listed in the Interministerial Committee's registry are not permitted. Sometimes contractors use old guardrails whose approval has expired. The committee sets a maximum three-year validity for each device, and expired guardrails are not authorized for use.

Guardrails Too Short - A guardrail section shorter than its minimum tested length will not stop a vehicle as required. The vehicle will simply "go around" the guardrail end.

Defective Connections - Loose bolts and nuts, missing connection parts, or using connections not suitable for the guardrail model.

Mixing Models - Connecting guardrail sections from different models or manufacturers without approval. Each guardrail is tested as a complete system, and mixing components may compromise performance.

Missing Energy Absorbers - As noted, this is a particularly dangerous mistake that occurs frequently.

Damaged Guardrails Not Replaced - A guardrail damaged by an impact loses its absorption capability. Even if it looks "okay," its internal structure may be compromised. Damaged guardrails must be replaced.

What to Check During Traffic Safety Inspections

When conducting a traffic safety inspection at a work site, here are the items that must be checked regarding guardrails.

First, verify that the guardrails installed on site match the approved traffic management plan - both in terms of location and type/performance level. Second, check that all sections are connected continuously without gaps. Third, verify the presence of end terminals or energy absorbers at the beginning and end of every guardrail system. Fourth, physically check connections - not just visually, but also by manual testing for looseness. Fifth, ensure reflectors are installed and functional. Sixth, look for signs of impact - scratches, bending, breaks - indicating an unaddressed collision.

Every finding must be documented with exact location, clear photos, and appropriate severity classification. A digital system like WorkSafety.io enables organized documentation and tracking of every deficiency until closure, ensuring that a guardrail finding - which is always a serious finding - doesn't get "forgotten" between inspections.

Relevant Legislation

The requirement to install safety guardrails at road work sites derives from several legislative sources. The Planning and Building Law and Occupational Safety Regulations establish the general obligation to protect workers and road users. Traffic Regulations govern the traffic arrangements required at work sites. The Interministerial Committee's guidelines, while not "law" in the formal sense, are the Ministry of Transport's binding document for device selection.

Important to note: non-compliance may lead to work stoppage by the local traffic authority, exposure to tort claims in case of an accident, and criminal liability for responsible parties.

Summary: Guardrails Are More Than Just Metal

Temporary safety guardrails are a complex engineering system designed to protect human lives. The correct selection of guardrail type, proper installation, and ongoing maintenance are all the contractor's responsibility, under the supervision of the traffic safety consultant.

As safety consultants, our responsibility is to ensure that site guardrails meet requirements - not "approximately," not "close enough," but precisely. Because when a 1.5-ton vehicle hits a guardrail at 110 km/h, the difference between "precise" and "approximate" is the difference between life and death.