行标JT／T307．1-1997《公路及主要构筑物、管理养护单位代码省干线公路代码》（以下简称《公路代码》）是由交通部标准计量研究所会同各省、自治区、直辖市公路管理局（处）共同起草的。该标准已于1997年3月21日正式发布，并自1997年8月1日起正式实施。为了更好地在全行业及相 Line standard JT / T307.1-1997 “Highway and major structures, management and maintenance unit code Provincial highway road code” (hereinafter referred to as “highway code”) by the Ministry of Communications Institute of Metrology in conjunction with the provinces, autonomous regions and municipalities directly under the Central Highway Administration Department) jointly drafted. The standard was officially released on March 21, 1997 and came into effect on August 1, 1997. In order to better in the industry and phase