Which of the following is NOT part of workzone design?

The activity vertex is not a recognized component of workzone design. In traffic control and workzone management, the design typically includes essential elements such as the buffer zone and transition area, both of which serve critical functions in maintaining safety and efficient traffic flow.

The buffer zone is designed to provide a space that separates the work area from traffic, reducing the risk of accidents. It's crucial for absorbing the impact from vehicles that may stray too close to the work zone. The transition area is where drivers are gradually guided from the normal traffic flow into a modified flow that accommodates the work zone. This area helps prepare drivers for changes while ensuring they have adequate time to react safely.

The term “activity vertex” does not have established relevance in the context of work zone design, which is why this choice is considered not part of standard work zone design terminology or practices.