Traffic Signs
Keeping the flow of people or vehicles in a safe and expedient mode is the objective of traffic control. Cars, buses, trucks, ships, airplanes, and bikes all want to have freedom of movement and in the direction of their choice without accidents, traffic jams and other obstacles that stop the journey.
The science of traffic control is in the management and
regulation of movement.Traffic engineers design and plan how the
destination will be reached. Methods that are incorporated are car
pools, public transportation, redesigning roads, and traffic
signs.
Widening the roads by adding lanes lets more vehicles go in a certain direction at one time. Building more roads and bypasses (usually a bridge like structure that leads to major highways) helps take traffic out of cities. This makes traffic in the city less hectic and easily to maintain. The major roads that run parallel to the cities are usually called interstates. These roads allow traffic to move at a non-stop pace. The speed limit is usually faster, but the police are always ready with a ticket if a vehicle is caught over the limit.
Traffic signals and signs, control the movement of
people and vehicles on the roads. The colors on a traffic light are
for the most part green to go, red to stop and yellow for caution.
There is usually a plan for the timing of the lights. Devices in the
road signal a computer how many vehicles are using the road at any
given time. The computer can make the timing of the lights follow the
amount of traffic. This allows heavily traveled roads the right of
way longer.
Traffic signs can be symbols on a post in the ground or computerized signs high above the road giving information on road conditions ahead.
Here are examples of traffic signs used around the world:
America:
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Brazil:
Canada:
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Iceland:
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Israel:
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Vietnam:
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The sites that have given permission to use their signs:
http://www.ugcs.caltech.edu/~jlin/
http://intlsigns.com/dirr.shtml
http://www.verkeer.demon.nl/b-index.htm (for the Dutch signs spread in the text)