When installing corrugated guardrails on highways, several key aspects require careful consideration:
(1) Post-Impact Deformation
The maximum dynamic deformation of the guardrail after impact should not exceed the permissible clearance between the guardrail and the protected object.
(2) Material Compatibility
The guardrail, its end terminals, and transitions to other guardrail types should utilize standardized materials for ease of installation and maintenance.
(3) Site Conditions
Factors such as shoulder and median widths, as well as roadside slopes, can influence the suitability of certain guardrail types for a specific location.
(4) Life-Cycle Cost
Beyond initial construction costs, consider long-term maintenance expenses. Avoid compromising quality for lower upfront costs, as substandard guardrails are prone to premature rusting and may fail inspection.
(5) Crashworthiness
The selected guardrail must effectively absorb impact energy, prevent errant vehicles from leaving the roadway or crossing into oncoming traffic, and redirect them safely. Different crashworthiness levels are required for different road types. For instance, rural roads might utilize B or C class corrugated guardrails, while highways require A or SB class guardrails with higher impact resistance.
(6) Maintenance Requirements
Consider the ease and extent of maintenance, factoring in routine upkeep, accident repairs, material availability, and accessibility for maintenance crews.
(7) Regional Performance
Learn from existing guardrail installations in the area and avoid repeating past design flaws or material choices that have proven ineffective.
(8) Aesthetics and Environmental Factors
Consider the guardrail’s visual impact on the surrounding landscape. Account for environmental factors like corrosion potential, weather conditions, and the guardrail’s impact on sightlines for drivers.
By carefully addressing these factors during the planning and installation stages, you can ensure the selection and implementation of corrugated guardrails that effectively enhance road safety and meet the specific requirements of the highway environment.
