Final answer:
A speed limit sign with 'school' and a yellow light typically indicates a school zone or school crossing ahead, serving as a caution for drivers to slow down for pedestrian safety. Installing traffic signals helps control vehicle speeds, ensuring safe pedestrian crossing.
Step-by-step explanation:
When you see a speed limit sign that mentions 'school' and has a yellow light above it, it typically indicates there is either a school zone or a school crossing ahead.
This is a safety measure to alert drivers to slow down and exercise caution because children are likely to be crossing the street on their way to or from school. Such a sign helps to address issues like vehicles speeding through intersections regardless of the speed limit and improves pedestrian safety, especially in areas where students and others need to cross the road to access campus facilities.
Installing traffic signals in such areas is an effective way to control vehicle speeds and helps to coordinate safe pedestrian crossing, greatly reducing the risk of accidents and enhancing safety for all road users. It's a critical response to problems of speeding vehicles and ensures safe crossing for pedestrians, thereby helping to prevent accidents and potential loss of life.