送孩子positive:
1:children could avoid crowding into bus or subway if school is far away from their home
2:Compared with other children who go to school by themselves ,it relatively saves much time if the traffic situation is good.
3:rule out some safety hazard.
negative:
1:the health of children decreases in a very fast speed due to their lacks of exercise.
2:children will depend on their parents more frequently than before when they face some trivial problems.
3:opportunity for approaching the society is getting fewer and fewer once they are protected by their parents.