Today I was pulled over and issued a written warning after exiting I-495 south at exit 12-11, Route 140 in Mansfield. I had turned right on red at the end of the ramp (near Xfinity Center) after stopping. I told the trooper, there is no sign there prohibiting right on red. He said, right on red is never permitted from an expressway off-ramp to a surface highway. I can't find anything like that in the Chapter 89 laws, nor in the driver's manual. Can anybody offer a qualified answer to this?