safety fence / fence

Technique of this product is simple.
LED turns on at a moment when ‘safety fence' becomes perpendicular to the road.
LED turns off when it runs parallel to the roads.
Fence extends perpendicular to the road and LED turns on, making it clearly visible even far away.
What the user should do is to simply turn the ‘safety fence’ toward the road for safety of his and others’ vehicles.
This fence can secure safety of emergency parking vehicle as well as that of municipal sanitation workers.