The context is that they're showing one metric among many and are hoping you'll draw the conclusion they want: that cars are an inefficient way to travel. It'd be interesting to see distance and time metrics added. For example, while pedestrian capacity is pretty large, the distance travelled for any specific time period is short, so people aren't walking somewhere 100 miles away.

Similarly, door-to-door travel time can vary a lot. Suburban commuter rail around here is fast, but you need to drive to the station (because suburbs are designed for cars), wait for a train, commute on the train, then find your way to your actual destination from the station you get off the train at, so that might include walking or public transit.

Obviously, any one of the options can make the most sense in a given situation, but the infographic isn't trying to show that.