What is not a function of traffic control devices?

Traffic control devices serve specific essential functions that contribute to the effective and safe management of roadways. One of their primary roles is to signal the need for caution, ensuring that drivers are aware of potential hazards or changes in road conditions. They also manage vehicle flow, directing traffic in ways that help reduce congestion and minimize the risk of accidents. Additionally, these devices are designed to enhance safety on the road, providing clear instructions and information to drivers and pedestrians alike.

Creating unnecessary roadblocks does not align with the primary purpose of traffic control devices. Such roadblocks would impede the flow of traffic and could lead to confusion and dangerous situations, which contradicts the fundamental objectives of traffic management. Instead, the goal is to maintain smooth operations on roadways while promoting safety and efficiency for all users.