A truck has lost several tonnes of asbestos before crashing into a guardrail in Sydney's west, police say.
A Mitsubishi tipper truck was driving along the M7 at Eastern Creek on Saturday morning before the crash unfolded.
As it travelled along an off-ramp, the truck allegedly lost a load of asbestos waste, believed to be between three to five tonnes, and crashed into a cement guard rail.
Emergency services closed the off-ramp while the asbestos sheeting was hosed down and contained.
A police spokesman said whether the load of asbestos was secured or not would be part of an investigation.
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Police have warned motorists about the dangers of unsecured loads leading to accidents and serious injury.
