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Single blue cat's eyes are used to indicate the location of fire hydrants. In rural settings and along State Highways, these markings are augmented by retroreflective posts along the edge of the road (white reflectors on the left, yellow reflectors on the right when on a left turning bend). Bridges are similarly marked with retro-reflective ...
Yellow — In addition to marking the median of freeways, in Victoria single yellow reflectors are used with broken yellow lines to denote tram tracks on which motorized traffic can drive, and double yellow reflectors are used with solid yellow lines to denote tram tracks on which motorized traffic may not drive other than to cross.
The lenses are available in a variety of different colors, mainly white, yellow/orange, green, red, and blue. Botts' dots (low rounded white or yellow dots), named for the California Caltrans engineer Elbert Botts , who invented the epoxy that keeps them glued down, are one type of a mechanical non-reflective raised marker.
Observation angle is a function of the distance between the headlights and the driver's eye, and the distance to the reflector. Traffic engineers use an observation angle of 0.2 degrees to simulate a reflector target about 800 feet in front of a passenger automobile. As the observation angle increases, the reflector performance decreases.
The double red light makes the red phase of the light visible at a greater distance than the yellow and green on the same signal. This installation is also used on rural highways in California , always in a vertical configuration, and in either configuration in some cities of Mexico , such as Guadalajara .
The red reflex (also called the fundal reflex) refers to the reddish-orange reflection of light from the back of the eye, or fundus, observed when using an ophthalmoscope or retinoscope. The red reflex may be absent or poorly visible in people with dark eyes, and may appear yellow in Asians or green/blue in Africans. [1]
Those red eyes you get from swimming aren't caused by chlorine, according to an official with the Centers for Disease Control and Prevention. %shareLinks-quote="Chlorine binds with all the things ...
The prohibition of stopping / waiting can be indicated by a yellow continuous line (Austria, the Netherlands, France, Liechtenstein, Switzerland and Russia), and in (certain cities of) the United Kingdom by a red continuous line (with double red lines extending the meaning to "no stopping at any time).