PURPOSE:To easily and speedily install the guide body at low cost by laying the guide body along the travel of a travel road surface part, making fused road paint flow onto the guide body, and covering the guide body. CONSTITUTION:An embedding groove 2 is formed in the travel road surface 1, a guide line as the guide body 3 is laid therein, the road paint 10 (heat fusion type traffic paint) which is fused is put in the embedding groove 2 automatically by using a marking machine which is generally used to sealing the groove and installing the guide body. At this time, the part on the road surface 1 is a line with specific width as a travel line indicating the travel path of the unmanned vehicle. Consequently, the operation time is shortened, the cost is reduced greatly, and the finish is made beautiful.
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