What are the blue reflectors on the street? What purpose do they serve?
What does the blue reflectors on the road do?
What does a flashing blue traffic light mean? Where are blue license plate lights legal? Why do police vehicles only use red and blue colors for their sirens? Why are police lights red and/or blue? What do different lines and colors on the road mean in the US? General Knowledge: Why do ambulance/police car siren have revolving lights? (Observed specifically in India) Why are police lights red and blue? How are reflectors and refractors alike? Why highways don't have lights? How are refractors and reflectors alike? Why don't highways have lights? What are these strips embedded in an asphalt street? Where from can I buy mirrors for reflector telescope living in Haryana? Why do railway traffic lights have green at the top and red at the bottom but road signals are the other way? Driving in California: Where are there cameras watching for running yellow or red-lights in San Francisco? What materials are used for road construction? Is a photoelectric effect used in street lights? Why do some drivers turn on their headlights in daytime? What does a flashing yellow indicate at an intersection? Is that a mirror on the canopy of the MiG 29? And what is its purpose? How can we tell if the blue I see is the same blue you see? LED driving lights in wet weather. Does it have a safer vision on wet roads? Why don't cars usually have auto-dimming side mirrors? What objects reflect light? How many types of siren are there for vehicles? What does it mean if a Honda Civic check engine light is flashing? Can a civilian use red and blue flashing lights on his vehicle? How red yellow green colors glow in traffic signals? What does the BMW warning light with the triangle and excalmation point mean? Why are police uniforms traditionally blue?