GOOD - a clever and fun way to draw attention to the fact that this is a learner driver and I found the magnets are strong enough to stay on the METAL (I think some reviewers try to attach them to plastic bumpers that doesn't work is a magnet) BAD - too much writing = not even visible a car length from the rear = people climbing on your bumper to find out what "careful" means, since it's the only thing that's slightly noticeable. Defeat the target. You need to make them bigger to be more efficient. Decided to use a different style, just "student drivers", hoping the larger font would be safer.
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