© The Institution of Engineering and Technology
The present authors (Kuan and Dimyati) acknowledge the comments of Foh and Tantra in their earlier Letter. In response, they argue that busy-idle conditions had been studied prior to the publication of Foh and Tantra's comments. From their observation, different interpretations of the collision probabilities and busy probabilities are identified as fundamental differences between the two Letters. In addition, both models emphasise different aspects of performance evaluation.
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