Forklift safety lights.
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Previously:
https://www.homemadetools.net/forum/...083#post160795
https://www.homemadetools.net/forum/...131#post187940
https://www.homemadetools.net/forum/...153#post184492
https://www.homemadetools.net/forum/...699#post178538
https://www.homemadetools.net/forum/...430#post166227