The council shall also have power to raise, by general tax upon all real estate and personal property aforesaid, such sum not exceeding 1/2 of 1 per cent of the assessed value of said property, as they shall deem necessary for highway and street purposes. Such moneys shall constitute a "general highway fund," and shall be expended exclusively for working and improving the highways, streets, lanes and alleys of the village and for the construction and repair of bridges therein.