Which of the following is a conical-shaped device used for channelization of traffic?

Traffic cones are designed specifically for the purpose of channelizing traffic. Their conical shape allows for easy visibility from a distance, helping to direct vehicles safely through construction zones, detours, or other areas requiring traffic management. The bright colors, often orange or fluorescent, combined with reflective strips, enhance their effectiveness in various lighting conditions, ensuring they are easily seen by drivers.

In contrast, bollards are typically short posts used to guide or protect traffic but are not conical and serve more as barriers than channelization devices. Delineators also aid in directing traffic but usually have a more vertical design and are often used on roadways rather than in situations typically requiring channelization. Flashing lamps provide warning signals but do not physically guide traffic in the way that traffic cones do. Thus, traffic cones are the most appropriate choice for the specified function of channelizing traffic.