Final answer:
The indicator that commonly signals a school zone or school crossing is yellow flashing lights. Traffic signals also play a crucial role in ensuring safe crossing for pedestrians, including students, at intersections near schools.
Step-by-step explanation:
Ensuring the safety of students and all pedestrians around schools is critical. When approaching a school zone or school crossing, certain indicators signal drivers to be cautious, reduce speed, and be prepared to stop if necessary. One common indicator is yellow flashing lights, which are often placed at or near crossings to alert drivers to the presence of a school zone, where children are likely present. These yellow lights are typically activated during the start and end of the school day and sometimes when children are present for activities outside regular school hours.
Another measure to improve safety is the installation of traffic signals, which are designed to manage vehicle and pedestrian traffic effectively. For example, consider an intersection where pedestrian safety is a concern. A traffic signal allows pedestrians, including students, to cross the road safely at designated times, mitigating the risk of accidents.
Green traffic signs, red curbs, and blue road markings do not typically indicate school zones or crossings. Green signs often provide direction or information about routes, red curbs may signal no parking zones, often for emergency access, and blue markings can indicate accessible parking spots. Hence, A) Yellow flashing lights are usually an indication of school zones or school crossings.