This red octagon sign indicates that vehicles must come to a complete stop on the occurrence of such a sign.
This sign indicates the maximum allowed speed limit for vehicles travelling on that particular road. The mentioned speed must not be exceeded in any situation, except for emergency vehicles.
This sign indicates that there is a school ahead on the road and drivers are required to slow down in order to avoid any mishaps involving children crossing the road.
This sign indicates the presence of a pedestrian crossing ahead, indicating the driver to slow down or come to a complete stop in order to let pedestrians safely cross the road.
This sign indicates that there is a cycle path intersecting the road and drivers should proceed carefully in order to let cyclists pass safely.
Parents are advised to teach their children about the basic road safety signs and to make them follow traffic rules (after following them themselves, obviously), in order to ensure road safety and avoid mishaps.