Sensor-friendly vehicle warning sign

A sensor-friendly vehicle warning sign having features designed to increase a likelihood of, or enable earlier, detection of the sensor-friendly vehicle warning sign by a sensor of an oncoming vehicle, the sensor-friendly vehicle warning sign comprising:

• a retroreflector having a planar or a three-dimensional shape;
• a coating applied to a planar surface, the coating including one or more metamaterials or metasurfaces;
• a power source;
• a light powered by the power source;
• a first controller regulating the light, the first controller receiving electric power from the power source, the first controller including a switch that turns the light on and off in a repeated pattern;
• a heating element powered by the power source, the heating element including one or more wires that emit thermal energy upon receiving electric power;
• a second controller regulating the heating element, the second controller receiving electric power from the power source;
• a reflective coating having a triangular shape, the reflective coating including a reflective material applied to a planar surface or a three-dimensional surface, the reflective material including beads of a transparent material acting like mirrors by way of being coated with a material, wherein the heating element is positioned around at least part of a periphery of the reflective material such that the heating element forms a border of the reflective material both on an outside and an inside of the triangular shape;
• and
• a corner reflector including a dihedral structure or a trihedral structure, wherein the reflective material is oriented substantially in a common direction with the corner reflector and the light;
• wherein respective geometric centers of each of the light, the heating element, the reflective material, and the corner reflector coincide with each other.