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Road Sign Usability

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Developing Instrument to Measure Road Sign Usability Abstract Questionnaires are the most widely implemented data collection method in evaluation research. This paper intends to introduce a psychometric instrument to calculate road signs usability based on road users’ perception on sign characteristics. Sign characteristics are attributes of a sign that affect its usability. Those attributes are found through review of literatures and subsequently adapted to construct questionnaire items. Calculation method and interpretation of the newly developed questionnaire will be introduced. The questionnaire underwent a series of validity and reliability check and used in a field test. Lack of suitable psychometric assessment of signs usability shows …show more content…

Modifications are made on SUS with the intention of enhancing it and make it suitable to assess the usability of road signs. The System Usability Scale (SUS) is a popular 10-item instrument in measuring the usability of diverse type of interfaces. SUS is a non- proprietary questionnaire developed by Brooke (1996). Its reliable, simple to administer and robust nature makes it a popular choice for general usability testing. Scoring the questionnaire yields a usability score in the ranges from 0 to 100. SUS can be implemented for any interfaces because of its generality. Bangor, et.al (2008) tested SUS for various interfaces, include cell phone equipment, customer premise equipment, graphical user interface for OS-based computer interfaces; interactive voice response phone systems, including speech based as well as web based …show more content…

I thought there was too much inconsistency in this system I thought that there was too much inconsistency in this road sign I would imagine that most people would learn to use this system very quickly I would imagine that most people would learn this road sign very quickly I found the system very cumbersome to use I found this road sign very awkward to understand I felt very confident using the system I felt very confident in my understanding of this road sign I needed to learn a lot of things before I could get going with this system I needed to learn a lot of things before I could understand this road sign The modified SUS is then presented to a panel of experts consisting of academicians and practitioners in the area of human factors for amendment. Reviews will be further described in stage 4. Aside from modified SUS, the final version of the instrument includes the addition of items on sign characteristics, in addition to 2 modified learnability items from Questionnaire for User Interaction Satisfaction (QUIS). Final version of the instrument is as follow: No. Item Adapted

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