Not only do we have those black and white signs here in Metro Boston, I pass this whimsical one on my commute, with two additional directives, in the People's Republic of Brookline. It's at a fork in the road (at the intersection of Cottage St and Goddard Ave) and faces the oncoming traffic entering the fork (see map below).
It's a somewhat scary fork because as I ride west on Cottage St, upcoming traffic behind me may drive past me as I try to cross over Cottage to Goddard Ave. The slight turn to my left shifts my rearward-mirror view
away from the traffic behind me, and often I stop to look and cross. So those signs are welcome.
Both streets are two lane without shoulders and carry a lot of commuter traffic. However there is an asphalt off-road path as seen in the photo. To my advantage also, I ride in the reverse commuter direction, with fewer cars on my side of the road.
