Guardrail highway

Simazine also became widely used in industrial weed control. It was effective, stable, and did not leach as readily as alternatives. Highway departments sprayed simazine under guardrails to eliminate the need for mowing. Railroads and utilities used simazine in mixes with other herbicides to get longer-lasting control of shallow germinating weeds. 

The Federal Highway Administration has approved the use of a guardrail-offset block made of 100% recycled wood and plastic. Although the product s initial cost is currently higher than for conventional block material, it is believed that the post will resist damage and deterioration better than conventional materials, thereby resulting in reduced overall lifecycle cost... 

Most of the injuries suffered by motorcyclists and cyclists on Spanish highways are due to collision with guardrails, particularly with the posts that support these protective devices. 

The developed system can be installed on the posts of the highways guardrails, where the polypropylene is affected by the environment, modifying the material mechanical properties. 

Another example is the standard on classification of motor vehicle traffic accidents published by NSC. It provides a uniform method for compiling data on highway accidents. The Federal Highway Administration (FHWA) provides formulas for calculating roadway departure crashes from crash rate data. The method helps highway planners select the types and locations for barriers and guardrails and implement other safety improvements. 

Figure 14-5. Concrete barriers provide protection for highway workers in construction zones, separate opposing traffic lanes and form bridge guardrails.

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