Vienna Convention on Road Signs and Signals
Ratifications and Signatories as of 2011
Signed, but not ratified
|Signed||8 November 1968|
|Effective||6 June 1978|
|Condition||Ratification by 15 states|
|Parties||62 (as of 2013)|
|Languages||Chinese, English, French, Russian and Spanish|
The Convention on Road Signs and Signals, commonly known as the Vienna Convention on Road Signs and Signals, is a multilateral treaty designed to increase road safety and aid international road traffic by standardising the signing system for road traffic (road signs, traffic lights and road markings) in use internationally.
This convention was agreed upon by the United Nations Economic and Social Council at its Conference on Road Traffic in Vienna 7 October 1968 to 8 November 1968, was done in Vienna on 8 November 1968 and came into force 6 June 1978. This conference also produced the Vienna Convention on Road Traffic, which complements this legislation by standardising international traffic laws.
The convention revised and substantially extended the earlier 1949 Geneva Protocol on Road Signs and Signals, itself based in turn on the 1931 Geneva Convention concerning the Unification of Road Signals.
Amendments, including new provisions regarding the legibility of signs, priority at roundabouts and new signs to improve safety in tunnels were adopted in 2003.
Both the Vienna Convention and the Geneva Protocol reflected a common consensus on road traffic signs that evolved primarily in Europe in the mid-20th century. Most jurisdictions outside Europe have not adopted either treaty, and maintain their own systems of road traffic signals. For example, the U.S. Manual on Uniform Traffic Control Devices (MUTCD) does not follow the symbol policy espoused by the Vienna Convention; perhaps most visibly, MUTCD specifies yellow lines between lanes of traffic moving in opposite directions and white lines between lanes moving in the same direction, whereas the Vienna Convention uses white for both. (Prior to the MUTCD, most roads in the United States used white for both; the use of yellow was to be consistent (white for same direction traffic, yellow for oncoming traffic) and to warn drivers that passing traffic in the other lane was oncoming; with markings being white for both same direction and oncoming it may not be possible for a driver to know if traffic in the left lane is traveling in the same direction or consists of oncoming traffic.)
In article 2 the convention classes all road signs into a number of categories (A - H):
- A Danger warning signs
- B Priority signs
- C Prohibitory or restrictive signs
- D Mandatory signs
- F Information, facilities, or service signs
- G Direction, position, or indication sign
- H Additional panels
The convention then lays out precise colours, sizes and shapes for each of these classes of sign:
|Class of sign||Shape||Ground||Border||Size||Symbol|
|Danger warning sign||Equilateral triangle||White or yellow||Red||0.9 m (large), 0.6 m (small)||Black or dark blue|
|Diamond||Yellow||Black||0.6 m (large), 0.4 m (small)||Black or dark blue|
|Yield sign||Inverted equilateral triangle||White or yellow||Red||0.9 m (large), 0.6 m (small)||None|
|Stop sign||Octagon||Red||White||0.9 m (large), 0.6 m (small)||Stop† written in white|
|Circular||White or yellow||Red||0.9 m (large), 0.6 m (small)||Stop† written in blue, or black inside red inverted triangle|
|Priority road||Diamond||White||Black||0.5 m (large), 0.35 m (small)||Yellow square|
|End priority||Diamond||White||Black||0.5 m (large), 0.35 m (small)||Yellow square and grey or black diagonal lines crossing the sign|
|Priority for oncoming traffic||Circular||White or yellow||Red||Unspecified||Black arrow indicating direction with priority, red arrow indicating direction without|
|Priority over oncoming traffic||Rectangle||Blue||None||Unspecified||White arrow indicating direction with priority, red arrow indicating direction without|
|Standard prohibitory||Circular||White or yellow||Red||0.6 m (large), 0.4 m (small)||Varies|
|Parking prohibitory||Circular||Blue||None||0.6 m (large), 0.2 m (small)||Varies|
|End of prohibition||Circular||White or yellow||None||0.6 m (large), 0.4 m (small)||Black, blue or grey diagonal line|
|Standard mandatory||Circular||Blue||None||0.6 m (large), 0.4 m (small), 0.3 m (very small)||Varies, white|
|Circular||White||Red||0.6 m (large), 0.4 m (small), 0.3 m (very small)||Varies, black|
|Special regulation signs|
|All signs||Rectangular||Blue||Unspecified||Unspecified||Varies, white|
|Information, facilities or service signs|
|All signs||Unspecified||Blue or green||Unspecified||Unspecified||Varies, on white or yellow rectangle|
|Direction, position or indication signs|
|Informative signs||Rectangular, sometimes with arrowhead||Light||Unspecified||Unspecified||Varies, dark|
|Motorways||Rectangular||Blue or green||Unspecified||Unspecified||Varies, white|
|Temporary||Rectangular||Yellow or orange||Unspecified||Unspecified||Varies, black|
|All panels||Unspecified||White or yellow||Black, blue or red||Unspecified||Varies, black or dark blue|
|Black or dark blue||White or yellow||Unspecified||Varies, white or yellow|
† May be written in English or the national language
It also specifies the symbols and pictograms which may be used, and the orientations in which they may be used. When more than one is available, the same one must be used nationally. All signs, except for those that do not apply at night, must be reflective enough to be seen in darkness with headlights from a distance.
The convention also specifies road markings. All such markings must be less than 6 mm high, with cat's eye reflectors no more than 15 mm above the road surface.
The length and width of markings varies according to purpose, although no exact figures for size are stated; roads in built up areas should use a broken line for lane division, while continuous lines must only be used in special cases, such as reduced visibility or narrowed carriage ways.
All words painted on the road surface should be either of place names, or of words recognisable in most languages, such as "Stop" or "Taxi".
The Convention specifies the colours for traffic lights and their meanings, and places and purposes lights may be used for, like so:
Red flashing lights may only be used at the locations specified above; any other use of the lights is in breach of the convention. Red lights must be placed on top when lights are stacked vertically, or on the side closest to oncoming traffic if stacked horizontally.
62 States at 30 June 2004: Albania, Austria, Azerbaijan, Bahrain, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Central African Republic, Chile, Côte d'Ivoire, Croatia, Cuba, Czech Republic, Democratic Republic of the Congo, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Guyana, Hungary, India, Iran, Iraq, Italy, Kazakhstan, Kuwait, Kyrgyzstan, Latvia, Liberia, Lithuania, Luxembourg, Macedonia, Mongolia, Montenegro, Morocco, Netherlands, Nigeria, Norway, Pakistan, Philippines, Poland, Portugal, Romania, Russian Federation, San Marino, Senegal, Serbia, Seychelles, Slovakia, Slovenia, Sweden, Switzerland, Tajikistan, Tunisia, Turkmenistan, Ukraine, United Arab Emirates, Uzbekistan and Zambia.
The only countries in Europe that are not party to the Convention are Iceland, Ireland, Moldova, Andorra, Malta and Liechtenstein, while Spain, the United Kingdom, and the Vatican City are all signatories but have yet to ratify the Convention.
- Full text of convention
- Consolidated text of convention including diagrams
- Amendments adopted in 2003