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Figure 10 - A submerged tyre reef showing considerable growth.

Despite the quality of the tyre reefs, the AFCD studies show that natural

quarry rock piles and biofilters make the best reefs. For this reason, the AFCD has no

future plans to use tyres in the creation of artificial reefs. Please refer to Appendix I

for more information regarding tyre reefs.

Rubberized Asphalt

The Hong Kong Highway Department has expressed interest in using

rubberized asphalt and has developed a pilot program to test the viability of the most

accepted and tested process of creating rubberized asphalt, the Arizona process,

developed by Arizona State University. According to Dr. Wong of the Civil

Engineering Department of Hong Kong Polytechnic University, the test phase of this

project, currently underway, is to ensure the Arizona process is suitable for Hong

Kong despite the extensive testing in the United States (See Appendix G). The Civil

Engineering Department of Hong Kong Polytechnic University, the Hong Kong

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