If your car doesn’t have a modern blind-spot warning system — available on most new vehicles — the Allview Mirror System (AMS) is a compelling substitute. The manufacturer states that the AMS is unlike an image-distorting convex mirror (the one with the phrase “Objects in Mirror Are Closer Than They Appear”). The flat, panoramic surface on the AMS increases your rearward field of vision without any distortion to a point where you’re able to observe multiple lanes of traffic without turning your head to check the outside mirrors. In turn, this allows you to more safely merge and change lanes. The AMS (replacement or clip-on versions) sells for $60. Get the full picture at www.allviewmirror.com.