Periodic Maintenance shall be planned for prioritized roads. Periodic Maintenance shall mean all maintenance works carried out on a defined project basis at intervals of several years. Some activities in these are also referred to as preventive maintenance. Typical activities on paved roads include resealing, overlays which justify the needs, fog sprays and shoulder re-forming. Typical activities on unpaved roads include re-gravelling, rip and re-compact and cross-section reforming.