From the Wellesley Department of Public Works:
Work on the Washington Street reconstruction project will take place during the next two weeks. Roadway milling work is scheduled for October 29 – 31 from Route 9 to Glen Road and from Morton Street to Wellesley Avenue. This work will take place overnight between the hours of 9pm to 5am. Roadway finish paving work is planned for November 5 – 7 from Route 9 to Glen Road and from Morton Street to Wellesley Avenue. Nighttime hours for this work are also 9pm to 5am. These work dates may be affected by weather conditions. Police details will be provided and detours will be in place during the work hours.
This schedule is intended to minimize the disruption of resident routines as much as possible. If you have questions at any time during the project, please contact the Wellesley DPW Engineering Division at 781-235-7600, extension 3315.
Thank you in advance for your patience and cooperation.

How about showing us this on a map? That would be super helpful…
Yep, I think this explains why noisy trucks were rumpling down Rt 16 all the way out in Sherborn deep into the night last night