There are even special systems that allow long phase justification of the amount of light waiting to drive through the intersection cars.
Then it is necessary to help electricians to solve problems, and control traffic can be much more difficult than the use of traffic lights.
It is true that, in a residential electrician main task is to install appropriate cables still in the process of building a house.Electricians installations also involved in other, less associated with electrical devices such as intercoms or monitoring.
Often, as far as their powers, electrician designs the future electrical installations.
An electrician's license entitles the holder to carry out all types of electrical installation work in Australia without supervision. However, to contract, or offer to contract, to carry out electrical installation work, a licensed electrician must also be registered as an electrical contractor..Under Australian law, electrical work that involves fixed wiring is strictly regulated and must almost always be performed by a licensed electrician or electrical contractor.A local electrician can handle a range of work including air conditioning, data, and structured cabling systems, home automation & theatre, LAN, WAN and VPN data solutions, light fittings and installation, phone points, power points, safety inspections and reports, safety switches, smoke alarm installation, inspection and certification and testing and tagging of electrical appliances. Electrical licensing in Australia is regulated by the individual states.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