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Road safety device for use on highway, has black and white markings painted on road surface, where markings are read by computer using photocell, and provisions acted on hardening accelerator
Road safety device for use on highway, has black and white markings painted on road surface, where markings are read by computer using photocell, and provisions acted on hardening accelerator
The device has black and white markings painted on a road surface, where the markings are read by a computer using a photocell. Provisions are acted on a hardening accelerator.
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