Originally Posted by
Roody
Yes, but this data only describes driving habits. Presumably people change their habits when they switch to cycling. That is, they change the frequency, distance and number of segments of their trips.
Once again you are making a false assumption. The NHTS covers all modes, and if anything tends to over estimate non-auto modes (from conversations and conferences with the FTA). The numbers and chart I derived from the data include those who made trips by walking, cycling, and taking transit as well as those who drive. Perhaps you should look at the rutgers report I posted above. It is derived from the NHTS data. You might find it interesting.
Simply changing to bicycling does not mean that the style of trips will (or even need to) change. As you said, nothing prevents cyclists from making multi-purpose trips...