eration, they are not normally controlling factors in the selection of a side protection barrier, except in the environmentally sensitive locations such as recreational areas or parks. In such cases, it is imporant that the systems used be crashworthy as well as visually acceptable to the road controlling authority.
It is also imporant to consider environmental factors in the selection process.
For example:
Barriers with considerable frontage area may contribute to a build up of drifting sand o