Cones, drums, barricades, etc. must meet which standard to be used in the clear zone?

The correct choice emphasizes the importance of safety standards in the context of traffic control devices used in the clear zone, particularly regarding their crashworthiness. NCHRP 350 (National Cooperative Highway Research Program) and MASH (Manual for Assessing Safety Hardware) Test Level 3 are recognized standards developed for assessing the safety performance of various roadside hardware, including cones, drums, and barricades.

In the clear zone, which is the area adjacent to the traveled way that is free of obstacles, using traffic control devices that have been tested to these specific standards ensures that they can withstand vehicle impacts without posing a significant risk to drivers. The NCHRP 350 and MASH Test Level 3 certification indicates that the devices have undergone rigorous testing for safety and performance, which is critical in preventing accidents or reducing their severity.

Using equipment that meets these standards is essential for maintaining a safe environment for both traffic control personnel and drivers, particularly in construction or maintenance areas where visibility and safety zones need to be clearly defined. This answer aligns with the established regulatory requirements for roadside safety and emphasizes the necessity for using reliable devices in critical areas like the clear zone.