Final answer:
In the reference frame of a moving bicyclist, a stationary pedestrian on the sidewalk appears to be moving in the opposite direction of the bicyclist.
Step-by-step explanation:
When you see a bicyclist in the roadway, it is important to be cautious and respectful of their presence. As a pedestrian standing on a sidewalk, if a bicyclist is passing by to your right, in the reference frame of the bicyclist, you would be moving in the direction opposite the motion of the bicyclist. If you were moving along with them at the same speed, you would appear stationary with respect to the bicyclist. However, since you are standing still and the bicyclist is moving, you are effectively moving backward from their perspective due to their forward motion.
In terms of roadway safety, the narratives included suggest the importance of being aware of your surroundings, whether it’s observing potential traffic issues, animals, or other pedestrians, and always being prepared to assist or seek help when someone is in need. Especially for those sharing the road, such as bicyclists, motorists should always look out and give them the right of way when necessary, to prevent accidents like the one described where a bicyclist was hit by a turning vehicle.