Voluntary activities and compulsory activities belong to different concepts. Don't mistake the instructions issued by the school for voluntary activities. Every parent has his own life plan and work. If parents don't have time to be on duty at the intersection, the school has no right to demand all kinds of behaviors of parents. What's more, every school will carry out voluntary duty activities, and those parents who are unwilling to be on duty will not affect their children's study.
As we all know, every parent will communicate with the teacher about their children's learning, which does not include the content of parents' obligations. What's more, it was previously reported that a school required parents to correct their homework. Correcting homework should be the teacher's responsibility. Parents sending their children to school does not include correcting homework. Teachers are professional guidance, and parents send their children to school because they value the educational environment and advantages of the school, rather than correcting homework.
To sum up, I think the school requires parents to be on duty at intersections every day, which has lost the significance of voluntary duty. What's more, every parent has his own job, and they can't guarantee that they can have enough time to be on duty. What's more, the main task of students is to study, and parents can only provide strong protection, but they can't share the pressure of students through voluntary duty.