I live just off a major university campus, with a main uni road that connects the two campuses. Road is two lanes (one each way) with a moderately wide bike lane and then a very wide, double-wide sidewalk. Joggers have even beaten a dirt path into the sidewalk where the grass used to grow, trying to save their knees.

Here is a species I want someone to explain: rather than using the wonderfully wide, dedicated sidewalk some joggers choose to run in the bike lane. Some even choose to run in the bike lane...going the wrong way. I scratch my head in amazement. They've been given this amazing sidewalk, wide, dedicated, not that busy...and they choose to run in the road, in the painted-off bike lane. I'm at a loss when I see these people.