Originally Posted by
blacknbluebikes
It could also be the other way around. Or somewhere in balance between the two, like "thoughtful vehicle operators are thoughtful on any vehicle" ... correlation vs causality, yada yada.
I'm going to agree with this one ^. Thoughtful, alert and well trained drivers are among the best drivers. The other factor is likely innate spatial and hand-eye coordination abilities.
I'm also going to agree that being an experienced road cyclist (if you are already a thoughtful, alert and capable driver) will make you a better driver when sharing the road with bicycle riders.