What type of delineation is used for portable barrier glare screen panels?

The correct answer is vertical stripes. Portable barrier glare screen panels are designed to minimize glare from headlights of vehicles and improve visibility for drivers in specific traffic situations. Vertical stripes on these panels effectively guide drivers' attention vertically rather than horizontally, which aligns with the intended purpose of the glare screens to reduce distractions and enhance safety.

This design choice aids in creating a clear separation between traffic lanes and mitigates potential confusion for drivers, particularly in high-traffic areas or near construction sites. By using vertical stripes, the visual effects help in reinforcing the presence of the glare screen, making it more noticeable and thus contributing to safer driving conditions.