Which of the following is a type of crash barrier?

The option referring to a redirective crash barrier is correct because such barriers are specifically designed to absorb the energy of impacting vehicles and redirect them back onto the roadway. This type of barrier is crucial in work zones or areas where there is a risk of vehicles colliding with roadside obstacles. By deflecting vehicles rather than allowing them to crash head-on, redirective barriers help protect both motorists and workers by preventing further accidents and reducing injury severity.

In contrast, other types of barriers or terms listed may not serve the same purpose or may not be recognized as formal classifications in crash barrier design. For instance, terms like superior or reinforced do not specifically indicate a barrier type used in traffic safety, while a fixed barrier typically does not offer the same dynamic safety features as a redirective barrier, which is why it isn't the best choice for crash mitigation in high-risk areas.