User Rating: 5 / 5

I dont remember how I came across this article, but it describes a lot of the theory, science, and testing that goes into the lowly concrete barriers that protect us on a daily basis.

The article is only a couple pages long, but it is full of interesting details about some of the different designs in use over the years, how the barriers actually stop vehicles from crossing them, and which barriers perform better than others. 

Basics of Concrete Barriers by Charles F. McDevitt