7MICHAEL W SAYERS,STEVEN M KARAMIHAS.The Little Book of Profiling University of Michigan Basic Information about Measuring and Interpreting Road Profiles[M].Ann Arbor:Transportation Research Institute,University of Michigan,1998.
3Michaelw Sayers,Stevenm Karamihas. The Little Book of Profiling University of Michigan Basic Information about Measuring and Interpreting RoadProfiles[M]. Ann Arbor : Transportation Research Institute, Univer- sity of Michigan,1998.
