For barriers used as channelization devices, what aspect is emphasized for effectiveness?

The emphasis on color and visibility for barriers used as channelization devices is crucial because these elements significantly enhance safety and clarity on the roadway. Channelization devices are intended to guide and direct vehicles and pedestrians, particularly in complex or hazardous areas. When they are brightly colored and highly visible, they draw the attention of road users, making them more likely to recognize and respond appropriately to the guidance provided.

Bright colors like orange and fluorescent yellow offer high contrast against various backgrounds, ensuring that the barriers stand out regardless of environmental conditions such as fog, rain, or nighttime darkness. This visibility helps prevent accidents by clearly indicating where drivers should or should not go, aligning with the primary goal of these devices: to promote safe traffic flow and protect both drivers and pedestrians.

While material strength, weight, mass, and ease of installation are important considerations, they do not directly impact the immediate effectiveness of channelization in conveying clear information to road users like color and visibility do.