00428 a2200121 4500 9780309117388 00775614 363.125 HAR Harkey, David L. NCHRP Report 617 Accident Modification Factors for Traffic Engineering and ITS Improvements / David L. Harkey....[et al] Washington : Transportation Research Board, 2008 various Pages ill. ; 30 cm Traffic Engineering 2227 2227 0 0 0 0 NIT NIT CE 0000-00-00 0 363.125 HAR NIT-6044 2017-01-05 2017-01-05 BK