Blind spot add on mirror is a necessity on today’s highways. Have fitted them to all my cars/truck. It is an extension of the admonition to check your mirrors frequently, so as not to be surprised by the speed racers. Related to comment is if you are going to pass, car or truck(esp. a truck) do it, don’t dog it. Longer you take, the longer a dangerous situation exists. Use signals and don’t cut off the passed car when you return to your lane.
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