Fig. 1. Korea express bus with wheelchair access
Fig. 2. Indicators for usability evaluation(RPE, DRS, ARS, SUS)
Fig. 3. The result of difficulty rating scale
Fig. 4. The result of Borg Rating of Perceived Exertion Scale
Fig. 5. The result of Acceptability Rating Scale
Fig. 6. The result of System Usability Scale
Table 1. General Characteristics of Subjects
Table 2. Scenario of wheelchair user getting on and off the bus
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