Final answer:
The sign that indicates a need to slow down and proceed with caution is the Yield sign. Other signs like Stop, No U-turn, and School Zone have different purposes, such as requiring a complete stop, prohibiting U-turns, or alerting drivers to slow down in a school area.
Step-by-step explanation:
The sign that indicates a need to slow down and proceed with caution is the Yield sign. This traffic control device is used at intersections to control traffic and ensure pedestrian safety by informing drivers that they must be prepared to stop if necessary to let a driver on another approach proceed. A Stop sign requires a full stop at an intersection, while a No U-turn sign indicates that making a U-turn is prohibited. A School Zone sign alerts drivers to a reduced speed area where children are present.
Installation of a traffic signal is often considered when there are safety concerns, such as when vehicles tend to speed through an intersection or when pedestrian safety at a campus crossing is compromised. The intention is to regulate vehicle and pedestrian traffic, thereby reducing the likelihood of accidents or injuries. For example, a traffic signal at the intersection of Clay Street and Eagle Avenue was installed to mitigate the issue of vehicles racing through, which put pedestrians, including many students, at risk, as they had to navigate through the busy traffic.