Radar retroreflective article

A retroreflective item comprising,

• a retroreflective layer capable of reflecting a radar signal comprising,
• cube corner elements having a side dimension from 2 mm to 65 mm,
• a metallic layer coated on the cube corner elements, and
• a dielectric layer adjacent the retroreflective layer having a permittivity from 4 to 30,
• wherein the dielectric layer is opaque,
• wherein the thickness of the dielectric layer is from 0.2 mm to 15 mm,
• wherein the retroreflective layer has a first major surface and an opposing second major surface and the first major surface defines a plane of the retroreflective item,
• wherein the ratio of the radar cross section with and without the dielectric layer is greater than 3 when the radar signal has an incident angle of 5 degrees with respect to the plane of the retroreflective item.