Abstract: A rear-view mirror for indicating to an operator of a vehicle the distance between his vehicle and another vehicle trailing therebehind. The device includes a substrate having a reflective surface and indicia thereon, wherein the indicia is dimensioned such that an image of the trailing vehicle substantially "fills" a spacing between opposing portions or segments of the indicia as the trailing vehicle is spaced a predetermined distance therebehind. The indicia may be non-illuminated for daytime use or may be illuminated for nighttime use. The indicia may have a variety of different configurations and may be configured to provide information to the operator of the vehicle as to a plurality of predetermined trailing distances for a plurality of types of trailing vehicles.