Guardrail, or the road safety fence, is one of the vital components in road transportation infrastructure, designed to prevent vehicles from leaving the route, reduce the severity of accidents, and protect the lives of passengers.
This structure is usually made of galvanized steel and is installed along roadsides, bridges, ramps, and mountain routes so that, in case of vehicle collision, it absorbs the impact energy and prevents falling or overturning.
The Importance of Using Guardrails on Roads
Road accidents are among the main causes of death around the world.
The use of guardrails causes:
Vehicles not to deviate from the route.
Prevention of vehicles from falling into valleys and off bridges.
Reduction of financial and human losses caused by accidents.
Increase of drivers’ safety in adverse weather conditions.
In general, the guardrail acts as the first line of defense of roads.
Main Components of a Guardrail
Each guardrail consists of several main parts:
Posts: which are firmly fixed into the ground and hold the structure.
Beam (Guardrail Sheet): the main part that receives and transfers the impact.
End Terminal (Energy Absorber): for absorbing the energy at the end of the route.
Bolts and Nuts: for firmly connecting all parts together.
Types of Guardrails Based on Shape and Application
1. Two-Wave Guardrail
The most common type of road guardrail, which has two waves or bends on its body.
Feature: High resistance against impact.
Application: Main roads and highways.
2. Three-Wave Guardrail
It has three bends on its surface and is stronger than the two-wave type.
Feature: Ability to withstand severe impacts.
Application: Busy and high-risk routes such as mountainous areas.
3. Bridge Guardrail
Installed to protect bridge edges against vehicle collisions.
Feature: High resistance to corrosion and rust.
4. Median (Divider) Guardrail
Used to separate two opposite traffic lanes on highways.
Feature: Prevents head-on vehicle collisions.
5. Industrial and Urban Guardrail
Used in urban areas, parking lots, ramps, and workshops.
Feature: Attractive appearance, painted surface, resistant to minor impacts.
Material and Coating of Guardrails
Guardrails are usually made of hot-dip galvanized steel to resist moisture, rain, and sunlight.
In some projects, painted or electrostatic powder-coated guardrails are used to increase durability and appearance.
Installation Steps of a Guardrail
Ground Preparation: leveling the soil and determining the installation points of posts.
Post Installation: using hydraulic hammer or concrete foundation.
Connecting Sheets: attached to posts by special bolts and nuts.
Final Inspection: ensuring the guardrail’s strength and alignment.
Guardrail Manufacturing Standards in Iran
In Iran, guardrails must be produced according to the following standards:
National Standard IRI-4844
International Standard EN 1317
These standards specify the level of resistance, sheet thickness, post spacing, and crash testing methods.
Advantages of Using High-Quality Guardrails
Increased safety of road routes.
Long lifespan and high durability.
Reduced maintenance costs.
Possibility of recycling and reuse.
Resistance against various environmental conditions.
How Is the Price of a Guardrail Determined?
The price of a guardrail depends on several factors, including:
Type of sheet (two-wave or three-wave).
Steel thickness.
Galvanized or painted coating.
Total weight per meter.
Type of post and number of connections.
Therefore, before purchasing, the project type, level of risk, and installation location must be specified.
Important Tips When Buying Guardrails
Buy from reputable suppliers.
Check the sheet thickness and galvanizing quality.
Obtain the national or international standard certificate.
In humid areas, use guardrails with thicker protective coating.
Conclusion
Guardrail is one of the vital safety equipment of roads that, by preventing vehicle falls and collisions, saves thousands of lives.
Choosing the right guardrail according to route conditions, road type, and traffic volume plays an important role in reducing accidents.
Therefore, using a standard and high-quality guardrail is considered a smart investment for every construction project.
Frequently Asked Questions (FAQ)
1. What material is a guardrail made of?
It is usually made of hot-dip galvanized steel to resist rust and corrosion.
2. What is the difference between a two-wave and a three-wave guardrail?
A three-wave guardrail is thicker and stronger than a two-wave one and is used in high-traffic or dangerous routes.
3. Is the guardrail used only on roads?
No, guardrails are also used in parking lots, factories, ramps, and industrial environments.
4. How much does one meter of guardrail cost?
The price varies depending on sheet type, thickness, coating, and manufacturer, and is usually calculated per meter or per kilogram.
5. What is the lifespan of a guardrail?
If made of high-quality steel and properly galvanized, a guardrail can last 20 to 30 years.
