Appendix I: SI and English Units and Conversion Factors

This appendix presents the SI and English (imperial) units, which are used in various areas of transportation engineering, and their conversion factors. Some metric units and factors that are not listed in the SI but are commonly used and remain internationally recognized are also included. Examples are the units of centimeter (10 2 m), hour (3.6 10 s) and kilowatt-hour (3.6 MJ) and multiples of 10, 10, 10 , and 10 .