Specifications include, but are not limited to: The Project will consist of roadway improvements along SR 25 and US 101. Along SR 25, the Project begins near post mile (PM) 2.1, just west of UPRR crossing, and continues to PM 2.6, at the terminus of SR 25 at US 101. Along US 101, Project improvements begin at PM 2.6, south of SR 25, and continue to PM 4.2, near Mesa Road. The Project includes the following key elements. Construct a new SR 25 overcrossing above US 101, just north of the existing SR 25 overcrossing, and demolish the existing SR 25 overcrossing structure. Construct new US 101/SR 25 Interchange on-and off-ramps and demolish the existing southbound US 101 off-ramp structure to SR 25. Construct a slightly realigned portion of northbound US 101 at the SR 25 overcrossing. Construct SR 25 starting at the new overcrossing structure and conform with the existing alignment just west of the UPRR crossing. Construct a Class I bike path adjacent to the US 101 Southbound off-ramp between Castro Valley Road and SR 25. Construct new traffic signals at the US 101 ramp termini with SR 25. Construct bridge structures, retaining walls, barriers, overhead signs, drainage, lighting, traffic monitoring, ramp metering, and other roadway features. Construct an irrigation system and perform 1-year Plant Establishment Period. Remove access to southbound US 101 at both Castro Valley Road and Mesa Road. Remove and modify access to several properties and construct new local roadway or driveway connections.
