The results revealed that although the present boat service provides imperfectly service, water transport service is clearly recognize as a sustainable mode of transport in Bangkok. This is due to the analysis results of this study indicated that this mode provides an effective service when comparing the average travel speed of its service with the road transport in the vicinity area as presented in
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Table 4. Thus, with the lower emission and more rapidly of service, the improvement of boat service quality in term of accessibility in other dimensions could attract more number of passengers and play a role as a key element to alleviate traffic congestion in Bangkok.