Kids like to play chase! We did both of the above. We played red light/green light, so they were somewhat used to stopping if they heard red light, but the most important thing is to be super proactive. It is my responsibility as a parent to not let them get into a situation that depends on their stopping just because of my voice. In situations where there are streets, parking lots, hot grills, etc, I need to be between the toddler and the danger and/or have the toddler in arm's reach at all times