The road works discharge several by-products such as aggregates and gravelly soil. While a large quantities of recycling resources and virgin materials are used in each road work. This is caused by the present enacted policy on the recycling plan and road works. This paper has presented an advanced recycling plan and alternative way of works to reuse and reduce generated and/or virgin aggregates based on the analytical results of the mass flow on road works. They have applied to analyze annual data of aggregates used and discharged in P prefecture as a case study. Estimated quantities of aggregates based on the alternative way of road works, coincide with observed ones. The results obtained in this paper suggests that aggregates generated in road works may be reused in situ to reduce its supplies of ones from other sources.