- Traffic sign design
Any tasks involved in the process of designing a
traffic sign . "Traffic signs give you important information about the law, warn you about dangerous conditions and help you find your way." These signs vary depending upon their use; they "use different symbols, colours and shapes for easy identification."Types of Signs
Regulatory signs
Regulatory sign s “give a direction that must be obeyed.” Often these signs show content or action that is either allowed or prohibited and these two modes are signified by colour (i.e. green and red), orientation (i.e. open circle and circle with diagonal line through the centre) and/or shape (i.e. square and triangle). Ministry of Transportation of Ontario. (2002). The Official Driver’s Handbook. Queen’s Printer for Ontario]Warning signs
Warning signs give a warning of that there are dangerous or unusual conditions ahead. Often these signs have a greater more conspicuous presence than aregulatory sign . These signs often do not have much text on them, as they should be internationally understood due to the nature of the message that they are conveying.Information/directional signs
Information sign s give information about direction and distance, usually guiding drivers to destinations, facilities, services and attractions. Often these signs have names of locations with an arrow pointing towards the direction of the destination and a number giving the approximate distance.Temporary Condition Signs
These non-permanent
temporary sign s are erected to warn drivers of unexpected conditions such as road work zones, diversions, detours, lane closures andtraffic control . Often these signs are portable and can also be digital variable message signs.Interaction design and traffic signs
When designing
traffic signs it is recommended to follow the four basic steps ofinteraction design : Identifying needs and establishing user requirements, developing alternative designs, buildinginteractive versions, evaluating the designs. [Preece, Jennifer; Rogers, Yvonne; Sharp, Helen. (2002). Interaction Design: Beyond Human-Computer Interaction. New York: John Wiley & Sons, Inc. ]Identifying needs and establishing requirements
Drivers,
cyclists ,pedestrians and other types of pedestrians are the users that will be interacting withtraffic signs . These users are using the roadways for transportation purposes and must receive information about the roadways and their destinations as they are traveling. [Preece, Jennifer; Rogers, Yvonne; Sharp, Helen. (2002). Interaction Design: Beyond Human-Computer Interaction. New York: John Wiley & Sons, Inc. ]Developing alternative designs
This task is divided into two categories:
conceptual design and physical design. Conceptual design will be the discussion of alternative traffic signs and ways of conveying information to the users. Physical design will be the discussion of what physical aspects (i.e. colour, shape, orientation) will be on the sign to convey the messages identified during the conceptual design. [Preece, Jennifer; Rogers, Yvonne; Sharp, Helen. (2002). Interaction Design: Beyond Human-Computer Interaction. New York: John Wiley & Sons, Inc. ]Building interactive versions
This task is the actually building of traffic signs. These can be
prototype s of a very low or veryhigh fidelity . [Preece, Jennifer; Rogers, Yvonne; Sharp, Helen. (2002). Interaction Design: Beyond Human-Computer Interaction. New York: John Wiley & Sons, Inc. ]Evaluating designs
This task is the testing of the prototypes and actual signs in order to determine if they convey the desired message in the desired time by the appropriate users. This will let the users know the usability of their signs. [Preece, Jennifer; Rogers, Yvonne; Sharp, Helen. (2002). Interaction Design: Beyond Human-Computer Interaction. New York: John Wiley & Sons, Inc. ]
Design Principles
Traffic sign comprehension and understandability are higher when the signs comply with
ergonomic principles. [Shinar, David; Dewar, Robert E.; Summala, Heikki; Zakowska, Lidia. (2003). Traffic Symbol Comprehension: A Cross-Cultural Study. Ergonomics 46(15), p 1549-1565] It is recommended to follow the below principles in order to increase driver comprehension and understandability.patial Compatibility
The matching between the physical
symbols on a sign with the literal directions/information the sign is trying to convey. “The physical arrangement in space, relative to the position of information and directions.” [Shinar, David; Dewar, Robert E.; Summala, Heikki; Zakowska, Lidia. (2003). Traffic Symbol Comprehension: A Cross-Cultural Study. Ergonomics 46(15), p 1549-1565]:*Application: Having a regulatory sign that informs a driver they must turn right, have an image of an arrow that curves to the right.
Conceptual compatibility
The correct association between the physical symbols on a sign and the information the sign is trying to convey. Good conceptual compatibility means that a driver will know the meaning of a symbol without having to reflect and interpret its meaning. [Shinar, David; Dewar, Robert E.; Summala, Heikki; Zakowska, Lidia. (2003). Traffic Symbol Comprehension: A Cross-Cultural Study. Ergonomics 46(15), p 1549-1565]
:*Application: Having an information sign that represents an airport, have an image of an airplane.
Physical representation
The similarity between the information that is being represented and the actual content on a sign. Good physical representation means that a driver will experience what is shown on a sign. [Shinar, David; Dewar, Robert E.; Summala, Heikki; Zakowska, Lidia. (2003). Traffic Symbol Comprehension: A Cross-Cultural Study. Ergonomics 46(15), p 1549-1565]
:*Application: Having a warning sign that means to watch for pedestrians have an image a person.
Frequency
The
frequency that which a sign appears will determine how familiar it is to drivers. Good frequency means that the sign is used often and that the meaning of its contents is well known. [Shinar, David; Dewar, Robert E.; Summala, Heikki; Zakowska, Lidia. (2003). Traffic Symbol Comprehension: A Cross-Cultural Study. Ergonomics 46(15), p 1549-1565]:*Application: Having a regulatory sign that informs drivers of the current speed limit of the roadway be frequently placed along every road.
tandardization
The extent to which any sign can be grouped into a type of sign with similar or equal shape, colour and orientation. Good
standardization means that all signs of the same type have the same template of shape, colour and orientation. Ideally standardization should be across cities,regions and countries. [- Ben-Bassat, Tamar, and David Shinar. (2006). Ergonomic guidelines for traffic sign design increase sign comprehension. Human Factors, 48(1), p 182-195]:*Application: Having all warning signs have a diamond shaped with a black border and a yellow background.
ingular Functionality
The representation of only a single meaning for a single sign. Good singular functionality means that a sign that gives information should not also imply a regulatory meaning or another piece of related information. [- Ben-Bassat, Tamar, and David Shinar. (2006). Ergonomic guidelines for traffic sign design increase sign comprehension. Human Factors, 48(1), p 182-195]
:*Application: Having an information sign that signifies the beginning of a school zone should not also be meant to imply that the speed limit in this area is reduced.
Visibility
The extent to which any sign can be seen. It should be visible by drivers of all age groups from an appropriate distance that will allow the driver to react to the signs contents.
Visibility also means that the sign has enough contrast with the background to be conspicuous and that the contents on the sign have enough contrast with the background of the sign to be conspicuous. [Wickens, Christopher D.; Gordon, Sallie E.; Liu, Yili. (1998). An Introduction to Human Factors Engineering. New York: Addison-Wesley Educational Publishers Inc.]:*Application: Having a white regulatory sign have a black border with a black symbol and a red highlight. “Solar-powered smart street signs that light up for easy reading at night, can add to readability.” [ Stridger, Ruth W. (2003). How Readable Are Your Street Signs? Better Roads, 73(8), p 36-38]
Conclusion
It has been shown that following these principles when designing traffic signs will make the signs more comprehensible. [- Ben-Bassat, Tamar, and David Shinar. (2006). Ergonomic guidelines for traffic sign design increase sign comprehension. Human Factors, 48(1), p 182-195] Minimizing the time and effort it takes drivers to interpret traffic signs may help to reduce driver mental workload and frustration. It is also especially important to attempt to follow the standardization principle because, due to the increase in globalization, many drivers may be visiting internationally. It is also particularly important to follow the principle of visibility because of the increasing average age, and thus vision difficulties, of drivers.
References
External links
* [http://www.mto.gov.on.ca/english/dandv/driver/handbook/section3b1.htm Ministry of Transportation of Ontario]
* [http://www.youtube.com/watch?v=WrfdQIg4ap0 Magic Roundabout]
* [http://www.th.gov.bc.ca/publications/eng_publications/electrical/MoST_PM.pdf Manual of Standard Traffic Signs and Pavement Markings]
* [http://www.mot.gov.il/wps/pdf/HE_TRAFFIC_PLANNING/LiteratureReview.pdf Researched-Based Web Design & Usability Guidelines]
* [http://www.seton.com/w2w_infolink/traffic_signs/trafficsign_FAQs.html?WT.ti=title&WT.cg_n=DYO%20Helpful%20Info&WT.cg_s=DYO%20ApplicationFrequently Asked Questions]
* [http://www.drivingschoolireland.com/signs-warning.html Driving School Ireland]
* [http://www.opsi.gov.uk/SI/si2002/20023113.htm Traffic Signs Regulations for the United Kingdom]
* [http://www.dft.gov.uk/pgr/roads/tss/tsmanual/ Traffic Signs Manual for the United Kingdom]
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