Theory: People on bikes are far more apt to comply with traffic controls - even at a time penalty - when they are explicitly intended for them. Think bike-specific signal faces.
Hunchy anecdata: Bike riders seem to wait for the short bike-exclusive community path crossing of Mass Ave at Cedar at even higher rate than peds wait for their earlier and longer-phase crossings. (I cede to @sofio wisdom here tho)
@aweechwhobikes yeah, def ones that are there because the reasonable alternative isn’t legal (Mass Ave/ Beech). Haven’t ridden these, but feel like I’ve heard mutterjngs about the Brookline ones before