Most countries erect signage, known as traffic signs or road signs, at the side of roads to impart information to road users. Since language differences can create barriers to understanding, international signs using symbols in place of words have been developed in Europe and adopted in most countries and areas of the world. Annexe 1 of the Vienna Convention on Road Signs and Signals of November 8, 1968 defines eight categories of signs:

• A. Danger warning signs
• B. Priority signs
• C. Prohibitory or restrictive signs
• D. Mandatory signs
• E. Special regulation signs
• F. Information, facilities, or service signs
• G. Direction, position, or indication signs
• H. Additional panels

However, countries and areas categorise road signs in different ways. In the U.S., the type, placement, and graphic standards of traffic signs and pavement markings are legally regulated — the Federal Highway Administration's Manual on Uniform Traffic Control Devices is the standard.

History

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The earliest road signs gave directions; for example, the Romans erected stone columns throughout their empire giving the distance to Rome. In the Middle Ages multidirectional signs at intersections became common, giving directions to cities and towns.

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mnt_neurology (MNT Neurology News) Thu, 07 Jan 2010 13:06:55 -0000
New Brain Scan Better Detects Earliest Signs Of Alzheimer's Disease In Healthy People http://mnt.to/3vZW
New Brain Scan Better Detects Earliest Signs Of Alzheimer's Disease In Healthy People http://mnt.to/3vZW
mnt_clinical (MNT Clinical Trials) Thu, 07 Jan 2010 13:06:50 -0000
New Brain Scan Better Detects Earliest Signs Of Alzheimer's Disease In Healthy People http://mnt.to/3vZW
December retail sales show signs of life http://bit.ly/8qwvhh
Newsflash (News Flash) Thu, 07 Jan 2010 13:06:44 -0000
December retail sales show signs of life http://bit.ly/8qwvhh
@sushirevenge can I tweet at red lights and stop signs?
cutefont (Telissa Carpenter) Thu, 07 Jan 2010 13:06:35 -0000
@sushirevenge can I tweet at red lights and stop signs?
If I lived in an area where near my house I saw signs that said "20 miles to Wisconson/Indiana" someone shoot me.
buttawilly (J W S 3) Thu, 07 Jan 2010 13:06:31 -0000
If I lived in an area where near my house I saw signs that said "20 miles to Wisconson/Indiana" someone shoot me.
Just arrived at Playhouse after v picturesque drive accompanied by Signs OST. Perfect :-)
hethfen (Heather Fenoughty) Thu, 07 Jan 2010 13:06:15 -0000
Just arrived at Playhouse after v picturesque drive accompanied by Signs OST. Perfect :-)

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