1. Information on http: /www. moc. gov. cn/06jiaotonggk/zongjiegb/index_1. html.
2. Information on http: /www. chinahighway. com.
3. Information on http: /www. zgjtb. com.
4. Li, Y.F. and Lin, A.Y.: Inspection, assessment and maintenance of bridges (China Machine Press, China 2003).