jgg     2010 30 (5):  140-143    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON RELIABLE ALGORITHM FOR HORIZONTAL DISPLACEMENT IN DIRECTION DIFFERENCE INTERSECTION Chen Debiao Lishui Vocational & Technical College, Lishui 323000 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null