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Cp IA 6: Patterns for Effective Interaction Design. Jenifer Tidwell. www.slideshare.net/haraldf/ia-6-patterns-for-effective-ixd
Due to the layout of the site, the access to the bridge had to be angled or curved. A curved approach was selected, to be effected with the deck boards. As seen here, the framework itself was angled.
You can see the 2x12s in place and the deck blocks sitting on top of them, with 4x4 supports to the framework.