What is the minimum diameter of a pipe required for vehicle crash protection?

The minimum diameter of a pipe required for vehicle crash protection is 2 inches, which is specified to ensure that the barriers are substantial enough to withstand impact without compromising their structural integrity. Pipes of this diameter can adequately serve their purpose in preventing vehicles from breaching protected areas. They provide a balance between functionality and manageability, offering sufficient strength while being easy to install and maintain.

The choices that reflect larger diameters, while potentially offering higher levels of protection, are not necessary as a minimum standard. A 2-inch pipe meets the regulatory requirements without making the implementation of safety measures excessively cumbersome or costly. Hence, the standard is set at this minimum to ensure practical application in real-world scenarios where vehicle barriers are needed.