On Tuesday, June 18, 2019 at 10:21:25 AM UTC-4, jbeattie wrote:

Motor pacing on a bike is illegal on the road since it is "following
too closely."

Not in massachusetts. The 'following too closely' statute applies exclusively to motorized vehicles here. I've been lectured by more than a few cops from various towns here over the (many) years, but that's it. One said "I'd ticket you if I could".