When should temporary traffic barriers be used in a work zone?

Temporary traffic barriers are essential in work zones primarily to protect pedestrians and workers from potential hazards, particularly from vehicle incursions. The correct use of these barriers enhances safety by creating a physical separation between moving traffic and areas where pedestrians may be present, like sidewalks or crosswalks. This application is crucial during any work that exposes pedestrians to the risks of vehicular traffic, especially in high-traffic areas where the likelihood of accidents is increased.

The other options suggest specific conditions under which barriers might be considered, but they do not encapsulate the overarching principle of protecting pedestrian pathways, which is a critical reason for utilizing temporary traffic barriers. Barriers might not be deemed necessary exclusively for night work, specific road repairs, or in response to severe weather; however, safeguarding pedestrians at risk of vehicle incursions is a consistent need regardless of the specific project conditions.