There are even special systems that allow long phase justification of the amount of light waiting to drive through the intersection cars.This is a very interesting solution, but it also can be subject to failure.
Then it is necessary to help electricians to solve problems, and control traffic can be much more difficult than the use of traffic lights.Electricity can make the traffic jams formed especially in large cities are less burdensome for enjoying the busy streets of people.
An electrician's license entitles the holder to carry out all types of electrical installation work in Australia without supervision.
In Western Australia the Department of Commerce tracks licensee's and allows the public to search for individually named/licensed Electricians.Źródło: https://en.wikipedia.org/wiki/Electrician
The movement of electric charge is known as an electric current, the intensity of which is usually measured in amperes. Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. By historical convention, a positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part..
Current defined in this manner is called conventional current.The motion of negatively charged electrons around an electric circuit, one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of the electrons. However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once. The positive-to-negative convention is widely used to simplify this situation.Źródło: https://en.wikipedia.org/wiki/Electricity