One-way traffic spike strip.
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Previously:
https://www.homemadetools.net/forum/...459#post208761
https://www.homemadetools.net/forum/...709#post201788
https://www.homemadetools.net/forum/...564#post139437
https://www.homemadetools.net/forum/...330#post192435
https://www.homemadetools.net/forum/...703#post139898
