HIGHWAY ENGINEERING(Part-6)
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TRAFFIC SIGNS
A traffic signs is a devices mounted an a fixed or portable support whereby a specific message is conveyed by means of words or symbols.Traffic signs should be placed such that they could be seen or recognized by the road users easily and time. The edge of the sign adjacent to the road should not be less than 0. m away from the edge of the kerb on the kerb roads.The nearest edge may be 2.0 to 3.0 m from the edge of the carriageway on roads without kerbs.
The traffic signs should be mounted on sign posts painted alternately with 25 cm black and white bands. The reverse side of all the sign plates should be painted gray. Traffic signs are divided into 3 categories-
(i) Regulatory Signs
(ii) Warning Signs
(iii) Informatory signs
- Regulatory Signs
The regulatory or mandatory signs of Traffic signs are used to inform the road users of certain laws and regulations to provide safety and free flow to traffic. The regulatory signs are classified under the following categories-
(i) Right of way series
It includes two unique signs i.e. stop and giveway that assign the right of way to the selected approaches of an intersection.
Stop Sign- It is intended to stop the vehicles on a roadway. It is octahedral in shape and red in colour white border.
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| stop sign |
Give Way- It is used to control the vehicle on a road so as to assign right of way to traffic on other roadways. This sign is in triangular shape with apex downwards and white in colour with a red border.
(ii) Movement Series
These are meant to prohibit certain traffic movements.
These are circular in shape and white in colour with a red border.
(iii) Parking Series
They are meant to prohibit parking and stopping verticals at that place.
These are circular in shape with a blue background, and a red border.
In no parking sign an oblique red bars at 45 degree and right angles to each other.
(iv) Speed Series
Speed limits signs are meant to restrict the speed of all or certain classes of vehicles on a particular stretch of a road.
These signs are cicular in shape and white background, red boarder and black numerals indicating the speed limit.
The vehicle control signs are circular in shape, red border and black symbols instead of numerals.
(v) Restriction Ends Signs
They indicates the point at which are at which are the prohibitions notifed by prohibitory signs for moving vehicles binding to apply.
They are circular in shape with white back ground and a board diagonal black band and 45 degree.
(vi) Compulsory Direction Control Signs
They are indicates by arrows, the appropriate directions in which the vehicles are bound to proceed.
These are circular in shape with a blue background and white direction arrows.
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Compulsory Direction Control Signs
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- Warning Signs
These signs are used to warn the roads users at sufficient distance in advance about the impending road condition.Warning Signs are also known as cautionary signs.This is also important sign of traffic signs.The warning signs are in the shape of equilateral triangle with its apex pointing in upward direction.
They have a white background, red border and black symbols.
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| Warning Signs |
- Informatory Signs
.Informatory signs are provided to guide the road user about the many routes,destination and to provide information which make travel easier, safe and pleasant.
The information signs are of following types:
(i) Direction and Place Identification Signs-
These are rectangular in shape with background, black border, black arrows and black letters. They include destination signs, direction signs, route maker and place identification signs.
(ii) The facility information Signs-
They are rectangular in shape with blue back ground and white/ balck letter/ symbols. Information signs used in public telephone, Petrol Plump, Hospital, First Aid Post etc.
(iii) Parking Signs-
They are set up parallel to the road using square sign board with blue background and white coloured letter 'P'.
(iv) Food gauge sign-
It is install at all cause ways.
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