I wonder if some of this is the way the data are collected. The survey asks about primary mode of commuting. In the DC area at least, I think (from observation)

I wonder if some of this is the way the data are collected. The survey asks about primary mode of commuting. In the DC area at least, I think (from observation) there are a lot more multi-modal commuters using bikeshare, uber, or e-scooters depending on circumstances, weather, etc. These commuters may not classify themselves as bike commuters as a primary mode, which would impact the numbers.