求翻译：1.3.1 本次施工范围：西起潍坊，东至寿光高速路，是已建成的潍坊高速路向东延伸部分，在0+312.44处与潍坊铁路相交，0+450处有小桥涵一座。是什么意思？

1.3.1 the scope: West Weifang East high speed road, Shouguang, is built of Weifang high-speed extension direction East, intersect with the Weifang railway at 0+312.44, 0+450 a small bridge and culvert: a seat.