The way of making circles directinonal:
Methode 1: Make sure the opposite direction do not come inside the circles.
Methode 2: The Poi it selfe is a alarm turn of. Put the Poi in the middle of road and the circles on the side you want the alert. If you drive over (staight over) the poi before reaching circles, the alert will be turned of before you reach the alertzone(circles).
Driving over circles(alertzone) before Poi will give alert.
The gps use ca 2 sec to turn of alert before reaching circles so dont put the circles closer or pass the poi.
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