Among the many changes the new law makes, it adds police training on bicycle law and dangerous behavior by bicyclists and motorists; explains how a motorist should safely pass a bicycle; explains how a motorist should safely make a turn in front of a bicycle; makes "dooring" (opening a car door into the path of a bicycle or other vehicle) subject to ticket and fine; permits bicyclists to ride two abreast when it does not impede cars from passing; and adds legal protections for bicyclists who choose to ride to the right of other traffic.
https://www.massbike.org/bikebill/index.htmoldId.20090118071637211
Biking in Baltimore