Update (May 6th): They have decided to allow left turns from Stone Quarry onto Spencer Road during this time. The barriers around the sidewalk work will be moved daily. When the barriers are out, there will be flaggers. When the barriers are in, there will not be flaggers, as motorists ought to be able to use the intersection as usual.
Here is the information received from INHS about the implementation of sidewalks along their property at 400-406 Spencer Road, and the subsequent changes to traffic patterns on the street during the sidewalk construction. (Please note: this will affect the 400 Block of Spencer Road and the Spencer Road/Stone Quarry Road intersection).
Construction of the new sidewalk and curbing will begin May 4th. In order to complete this work a section of Spencer Road will need to be reduced to one lane during daytime working hours Monday May 4th through Friday May 15th from 7:30am to 4:00pm. When work is complete for the day two-way traffic will be restored. In addition, left turns from Stone Quarry Road onto Spencer Road will not be allowed at any time from May 4th through the 15th due to the construction barriers required to keep workers safe. Below is a diagram that shows where the work will occur. The yellow flags represent flagging stations where flaggers will be directing traffic. The thick red line represents a concrete barrier which will not be moved each day but will allow two lanes of traffic to pass. The red dotted line represents moveable barriers which will reduce traffic to one lane during work hours and then moved to allow two lanes of traffic when work is finished for the night. Temporary signage will be installed to inform drivers of these changes to traffic patterns. This work and disruption to traffic will be complete by May 15th. If there is a change to this timing INHS will notify. This plan has been reviewed with the City of Ithaca Traffic Engineer. If you have any questions please do not hesitate to contact Joe Bowes at INHS at 607-277-4500×204.
Source: Memo from INHS: Temporary Changes to Traffic Patterns (pdf). Contains larger-size diagram shown above.
Clarification: The 400 block of Spencer Road will NOT be a one way road during those hours. It will be one lane with cars only able to go in one direction at a time. Flaggers will be at each end of the block coordinating traffic.