What about those little speed bump reflectors? They never need servicing.
And if you drift because you are on the cell phone [big mistake], falling asleep [big mistake], in a rainstorm [act of God], very dark outside and the driver has poor vision [fact of life], daydreaming [little mistake], drank too much[big mistake], overtaking a bicycle [no harm done] ----you would get a little reminder [thump,thump,thump].
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