During road and freeway work upgrades, existing drainage grates that are normally out of traffic flow were placed into traffic flow. While the grates had previously been tested in accordance with Australian Standard 3996, the client was concerned that the system holding down these grates would fail due to repeated vehicle loading potentially resulting in grates being flung into traffic and drainage pits being exposed. To avoid these two potential safety risks, the client needed to develop and test a lock-down system for the grates to ensure they could withstand the increased vehicle cyclic loading.

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