When directing vehicles, the hand signals used must be:

The choice indicating that hand signals must be clear and simple is essential for effective communication, especially in situations where the safety of pedestrians and the proper flow of traffic depend on concise understanding. Clear and simple signals ensure that drivers can quickly recognize and respond to directions, reducing the likelihood of confusion or accidents.

In high-traffic environments, where attention spans are short and distractions abound, complex or detailed signals may not be easily understood or remembered. Therefore, simplicity is key to ensuring that instructions can be interpreted at a glance. Similarly, while verbal instructions can complement hand signals, relying solely on them may not be feasible in all situations, particularly in noisy environments where they might not be heard. Color coding and written instructions can be helpful in some contexts but are not as practical for immediate, real-time direction. Thus, the emphasis on clarity and simplicity in hand signals makes this choice the most effective approach for directing vehicles safely.