How to Design Guardrail

The design guidelines for all barriers is taken from the AASHTO Roadside Design Guide. Determining if Guardrail is Required It is necessary to calculate a “clear zone” which is a distance from the pavement edge within which there should be no hazards. If a non-breakaway appurtenance must appear within the clear zone, a barrier is […]


What is the correct Guardrail height?

Highway guard rail is one of the most well researched transportation devices. The height to which it’s installed, measured vertically from the pavement edge, is an important consideration. I’ve had to look this number up many times, and did so again to prompt me to write this article. So what is the correct height? Following […]

Types of Guard Rail

Guard rail absorbs the impact of out-of-control vehicles while guiding the vehicle to safer stops. There are three types of guard rail in primary use today. Flex Beam Thrie-beam Cable barrier Flex Beam Also called W-beam, flex beam is the cheapest and easiest to install, and thus the most popular guard rail in use today. […]