All other things being equal, which do you prefer? Let's give this hypothetical road a bit of everything. Some climbs, some flats, some descents, some curves and some straight sections, one lane in each direction, with a posted speed limit of 55 and traffic speeds varying accordingly. Do you feel more comfortable with a large comfortable shoulder width, but with heavy traffic volume, or a narrow to non-existent shoulder, but with a lower traffic volume? If you are planning a tour and this information is available to you, does it play a large factor in planning your route, or is it more important for you to just go where you want?