From the Harwich Police Department (verbatim):
Sisson Road will be closed between RT 28 and Gilbert for the foreseeable future while crews work to pump the gas off of the tanker before it is removed.
As a precaution, Eversource has shut power off in the immediate area as a precaution while the crews pump out the gas.
The driver was able to safely remove himself from the truck but was transported to the hospital as a precaution.
We will continue to post updates as the day progresses.