Solar Traffic Lights

1 January 2017

Most solar traffic lights use LED lamps as they are more reliable and have more advantages over other lighting devices like CFL lamps as they are more energy efficient, have a longer life span and turn on and turn off quickly. Solar traffic lights contain enclosures which house the batteries and the control panel circuitry. The other parts in a solar traffic light include a charge controller to control the charging and discharging of the battery and a countdown timer which displays the amount of time left before the battery discharges fully.

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Advantages • Solar traffic lights are self sufficient as they do not require external power sources. • They are easy to set up and operate. • They require very little to no maintenance as they have no moving parts Types Traffic lights can have several additional lights for filter turns or bus lanes. This one in Warrington, United Kingdom, also shows the red + amber combination seen in a number of European countries. It also shows the backing board and white border used to increase the target value of the signal head.

Improved visibility of the signal head is achieved during the night by using the retro-reflective white border. [pic] | | | The simplest traffic light comprises either a single or a pair of colored aspects that warns any user of the shared right of way of a possible conflict or danger. [pic] • Flashing Red: Treat as a stop sign.

Also can signal the road is closed. • Flashing Amber: Caution, crossing or road hazard ahead • Flashing Green: Varies among jurisdiction; can give permission to go straight as well as make a left turn in front of opposing traffic (which is held by a steady red light), or can indicate the end of a green cycle before the light changes to a solid amber. Dual aspects | | These are often seen at railway crossings and at intersections of streets and emergency department driveways.

They will flash amber when cross traffic is not expected, and turn red to stop traffic when cross traffic occurs. Three or more aspects The universal standard is for the red to be above the green, with amber placed in between. When mounted vertically red is on top, but when mounted horizontally the red light’s location depends on the rule of the road, being on the left in a country that drives on the right and on the right in a country that drives on the left. pic] In addition to the standard red, amber, and green aspects, other aspects are usually mounted when intersection require more control (i. e. public transport, and permissive turns). Traffic lights in this configuration tend to have a delay between any entry points to allow any residual traffic in the intersection to clear. The delay can be dependent upon the type of intersection, traffic, and road conditions.

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