Before entering upon his duties each road overseer shall execute to the county a bond in such sum as may be fixed by the county commission, with good and sufficient security to be approved by the commission, the condition of such bond to be that he will faithfully discharge his duties as such road overseer, and that he will account for all sums of money received by him as such overseer, and that he will account to the county highway engineer, at the expiration of his term of office, for all tools, machinery, books, papers and other property belonging to the county or district, and such bond may be sued upon by the county to the use of the road district or any person injured by a breach thereof.