Once a helpful person on the phone at the RMV encouraged me to report errors and said they would be corrected. However, the next time I called I got an attorney who angrily insisted that nobody in a position of authority would have ever said such a thing. He demanded to know who I had talked to, presumably so he could discourage that person from ever suggesting that the RMV might be wrong or responsive to complaints.

Although the manual says otherwise,

• A yellow advisory speed sign is not a speed limit sign and need not be obeyed.
• Orange construction zone speed signs are also advisory, not regulatory.
• There is no minimum speed limit on limited access highways in general. There is a 40 MPH minimum speed limit on the Massachusetts Turnpike and a 20 MPH minimum speed limit in the harbor tunnels.
• An inactive signal is the same as no signal. One need not stop unless traffic is approaching from the right.
• Vehicles do not need to yield to pedestrians crossing against the signal. (However, all persons have a duty to use due care to avoid a collision notwithstanding another's negligence.)

See also http://www.bikexprt.com/bicycle/drivmanl.htm.