Specifications include, but are not limited to: THE PURPOSE OF THIS PROJECT IS TO REPLACE THE I-49 OVERPASS BRIDGE STRUCTURE AND MODIFY ROADWAY APPROACHES TO A SINGLE POINT URBAN INTERCHANGE (SPUI) SYSTEM AT THE HWY. 71B INTERSECTION, INSTALL NEW SIGNALS AT THE RAMPS, MOBERLY LANE, AND N. 46TH ST., AND WIDEN HWY. 71B FROM FOUR LANES TO SIX LANES IN BENTON COUNTY. THIS PROJECT CONSISTS OF REMOVAL AND DISPOSAL ITEMS, EARTHWORK, TRENCHING AND SHOULDER PREPARATION, AGGREGATE BASE COURSE, PORTLAND CEMENT CONCRETE BASE, ACHM BASE, BINDER, AND SURFACE COURSES, COLD MILLING, APPROACH SLABS AND GUTTERS, PRECAST CONCRETE BARRIER, MINOR DRAINAGE STRUCTURES, GUARDRAIL, EROSION CONTROL ITEMS, CONCRETE BARRIER WALL, RUMBLE STRIPS IN ASPHALT SHOULDERS, TRAFFIC SIGNAL ITEMS, RETAINING WALLS, A SIMPLE COMPOSITE PLATE GIRDER SPAN BRIDGE (239.21'), SHORING, PAVEMENT MARKING, AND MISC. ITEMS.