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<center><span STYLE="font: 60pt arial;">'''305'''</span></center> | [[File:305-002.jpg|200px|thumb|center|'''21AA Aggregate Pile (Limestone)''']]

'''Approach:''' An approach is the section of roadway leading up to a bridge, culvert, or a main roadway. It is design ...ade is the existing ground or soil surface upon which the road or pavement section is constructed. It serves as the foundation for the road layers above and m