The first one is to increase the strength of the crossbeam and the second one is to increase the intensity of the column. The strength of the column is influenced by the bearing capacity of the foundation soil. The work will be very complicated if the foundation of every column is reinforced. But increasing the number of the columns can also improve its ability to resist high collision force.
In addition, increasing the strength of the wave beam can have a certain effect on avoiding "pocketing" (Pocket phenomenon) caused by heavy load collisions. However, increasing the wave height and board thickness or improving the shape of the cross-section will greatly increase the cost. Therefore, we use the method of increasing the density of column’s interval to strength the guardrail. That is to say, the Sm grade is reinforced and the column’s interval is 2m. Compared with the rigid guardrail, the reinforced guardrail is very flexible, which has been proved in the practical application of freeways.
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