Is it common sense not to run after a bus that’s left you behind? Most definitely. But that’s not to say pedestrians aren’t in need of the occasional reminder.

In response to a fatal accident in the District last week in which a man slipped and fell under the wheel of a moving Metrobus, the transit system has agreed to develop a message sign — something to the effect of “Stay Safe, Don’t Chase” — and corresponding icon warning riders against chasing a bus or train.