To command respect from road users, traffic control devices should?

Traffic control devices serve as critical tools in managing road user behavior, ensuring safety, and facilitating smooth traffic flow. For these devices to command respect from road users, they must be easily recognizable and understandable. This means that signs, signals, and other devices need to convey their messages clearly and at a glance.

When road users can quickly comprehend the function and meaning of a traffic control device, they are more likely to heed its instructions. Familiar shapes, colors, and symbols also enhance immediate recognition. Devices that are straightforward reduce confusion and the likelihood of accidents, ultimately promoting safer road conditions.

In contrast, the other choices focus on traits that may detract from the effectiveness of traffic control devices. Using expensive materials does not guarantee better visibility or comprehension, and complexity in design can lead to misunderstandings among road users. Lastly, placing devices in obscure locations can result in them being overlooked entirely, which defeats their purpose of guiding and regulating traffic effectively.