Patent ID: 8840335
Filing Date: 2014-09-23
Classification: E01C,E01F,F21S,F21V,F21W,F21Y,G08B,G08G

Abstract:
1. A road marker including a metal housing with at least one surface of the housing being transparent, the housing enclosing passive electrical components including: (a) a circuit board; (b) a thermal sensor coupled to an input terminal on the circuit board wherein the thermal sensor has at least 0.5° C. of hysteresis to prevent rapid on/off cycling of the at least one light-emitting diode; (c) a photovoltaic (PV) module coupled to an input terminal on the circuit board; (d) at least one energy storage element coupled to an input terminal on the circuit board; and (e) at least one light-emitting diode coupled to an output terminal of the circuit board; wherein the at least one light-emitting diode illuminate when the thermal sensor detects a predetermined temperature.