A road marker may include a housing with a cavity and at least one perimeter surface oriented perpendicular to the direction of traffic. Each of the at least two perimeter surfaces containing an opening may be substantially covered with a mesh. Further, each of the openings may form either an air input or an air output, and the air input and air output openings may be located substantially opposite to each other to generate a flow of air through the cavity. In addition, the cavity may include passive electrical components for heating the flow of air.

A road marker may include a housing with a cavity and at least one perimeter surface oriented perpendicular to the direction of traffic. Each of the at least two perimeter surfaces containing an opening may be substantially covered with a mesh. Further, each of the openings may form either an air input or an air output, and the air input and air output openings may be located substantially opposite to each other to generate a flow of air through the cavity. In addition, the cavity may include passive electrical components for heating the flow of air.

A self-contained solar-powered illuminated safety marker having an improved housing design adapted for secure, flush-mounting into a road surface which includes a projection positioned to extend vertically downward from the bottom surface of the safety marker to secure the housing in its flush mounted position into a road surface and a solar cell with circuitry designed to illuminate the safety marker in response to a variety of environmental conditions.

A road sensor system for sensing data about a road surface and for providing that data, in real time, to data receivers. The system includes a communications network and a data control center that receives and transmits data via the communications network. Sensor assemblies include a housing that is implanted into the road surface, a sensor in the housing that collects sensor data related to an area local to the sensor assembly, and a communications module for communicating sensor data via the communications network from the sensor to the data control center for storage in the database. Sensor data received and stored is associated with location data for a location of the road surface where the housing is implanted. The data receivers receive sensor data or metadata derived from sensor data via the communications network.

A defogger defogs a reflective mirror with heat from sunlight without relying on electric power. A defogger for a reflective mirror includes a heat collector with a hollow structure to store heat from sunlight, an air inlet port through which air is fed into the heat collector, a warm-air outlet port through which air from the heat collector is discharged in a heated state, a support attached to a pole of the reflective mirror, and a connector connecting the heat collector and the support. The structure allows warm air discharged through the warm-air outlet port to come in contact with the surface of the reflective mirror to increase the surface temperature and thus defog the reflective mirror.

A self-contained solar-powered illuminated safety marker having an improved housing design adapted for secure, flush-mounting into a road surface which includes a projection positioned to extend vertically downward from the bottom surface of the safety marker to secure the housing in its flush mounted position into a road surface and a solar cell with circuitry designed to illuminate the safety marker in response to a variety of environmental conditions.

A road display board system device capable of snow melting control includes a detection sensor configured to detect rain and/or snow, a humidity sensor configured to measure a humidity of air, a first temperature sensor configured to measure a temperature of the air, a second temperature sensor configured to measure a temperature of a road surface, a dew point temperature calculator configured to calculate a dew point temperature of the air by matching the humidity of the air and the temperature of the air with a dew point calculation table, a danger time point estimator configured to estimate an icing caution time point and an icing time point, a display configured to display a driving caution guide from the icing caution time point, and a heat supply controller configured to supply heat to the road surface from the icing time point.

A road display board system device capable of snow melting control includes a detection sensor configured to detect rain and/or snow, a humidity sensor configured to measure a humidity of air, a first temperature sensor configured to measure a temperature of the air, a second temperature sensor configured to measure a temperature of a road surface, a dew point temperature calculator configured to calculate a dew point temperature of the air by matching the humidity of the air and the temperature of the air with a dew point calculation table, a danger time point estimator configured to estimate an icing caution time point and an icing time point, a display configured to display a driving caution guide from the icing caution time point, and a heat supply controller configured to supply heat to the road surface from the icing time point.

Portable traffic message signs configured for use on or near roadways, highways, sidewalks, and/or other travel routes. The portable traffic message sign may be configured to provide instructions, warnings, alerts, and/or other information for travelers. In some embodiments, the portable traffic message sign may be configured to be adaptive in response to sensed weather, traffic, and/or other conditions. For example, the portable traffic message sign may have a controller determining suitable message content to display, the message content reflecting a present traffic and/or weather condition. Moreover, the message sign controller may select, based on a speed of travel of traffic, words, phrases, and/or pages to display the message content such that the message may be perceivable by oncoming travelers. The controller may control height, angle of rotation, and/or other orientation parameters of the message sign toward a point of aim in order that the message may be perceivable by travelers.

Portable traffic message signs configured for use on or near roadways, highways, sidewalks, and/or other travel routes. The portable traffic message sign may be configured to provide instructions, warnings, alerts, and/or other information for travelers. In some embodiments, the portable traffic message sign may be configured to be adaptive in response to sensed weather, traffic, and/or other conditions. For example, the portable traffic message sign may have a controller determining suitable message content to display, the message content reflecting a present traffic and/or weather condition. Moreover, the message sign controller may select, based on a speed of travel of traffic, words, phrases, and/or pages to display the message content such that the message may be perceivable by oncoming travelers. The controller may control height, angle of rotation, and/or other orientation parameters of the message sign toward a point of aim in order that the message may be perceivable by travelers.