Appendix B to Subpart B to Part 591 - Places and Rates At Which Differentials Are Paid

Degree A Commuting Conditions

Good paved roads; climatic conditions, in relation to type and quality of vehicle, cause minimal discomfort during trip.

Degree B Commuting Conditions

Roads typically fair, but may be good for part of distance and possibly unpaved for short distances; climatic conditions during part of a season, in relation to type and quality of vehicle, result in moderate discomfort during trip.

Degree C Commuting Conditions

Fair to poor roads, unpaved for part of distance, climatic conditions during most of a season, in combination with such factors as type and quality of vehicle and terrain, result in unusual discomfort during trip.