Japanese speed scare / warning system スピード違反取り締まり装置

This warning system mimics photo radar and Police flashing siren

It suppose to warn you about incoming curve and tunnel as you go down the hill. Actually it scares too if you drive too fast.
It activates every time despite your speed.

This one is located in Hokkaido

スピード違反取り締まり装置　ネズミ捕り　速度違反自動取り締まり装置　レーダー探知機

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