In this paper the change of condition ratings are investigated for old highway bridges. The results of condition ratings are selected from those by professional inspector. The bridges are categorized as four types. The inter-relationship of service life, structural elements, condition ratings are investigated to evaluate the deterioration characteristics of bridges

• 박창호(한국도로공사 도로교통연구원 수석연구원) | Park, Chang-Ho
• 이일근(한국도로공사 도로교통연구원 책임연구원) | Lee, Il-Geun
• 장동휘(한국도로공사 도로교통연구원 박사후연구원) | Jang, Dong-Hui