Which certification must all traffic control devices meet?

The correct answer is that all traffic control devices must meet the NCHRP 350 certification. NCHRP 350, which stands for the National Cooperative Highway Research Program Report 350, provides guidelines for the safety performance of roadside hardware, including traffic control devices such as barriers, signs, and signals. This certification ensures that these devices undergo rigorous testing and evaluation to confirm they perform safely and effectively when struck by vehicles.

By complying with NCHRP 350, agencies can ensure that the traffic control devices they deploy minimize the risk of harm to drivers, pedestrians, and other road users, thereby enhancing overall road safety. This certification is particularly important in the context of work zones and varying traffic conditions, as it establishes a standard for durability and crashworthiness.

The other certifications listed, while important in their respective fields, do not apply specifically to traffic control devices. ISO 9001 pertains to quality management systems, OSHA 1910 covers occupational safety and health standards, and ASTM D3039 is related to the testing of composite materials. These do not address the specific safety performance requirements necessary for traffic control devices, making NCHRP 350 the appropriate certification in this context.