Page 257 - Proceeding of Atrans Young Researcher's Forum 2019_Neat

“Transportation for A Better Life:
Smart Mobility for Now and Then”

23 August 2019, Bangkok, Thailand

time costs which are calculated by using equation (1)
are compared, and the travel time reduction benefit
is calculated as the difference. In this study, in order
to clarify the impacts of adaptation measure, we
estimated the benefit of travel time reduction every
one and a half months (45 days). This is due to the
urban floods occurred in 2011 have affected
continued about 45 days.

BT     Q T  a  45 (1)

Fig. 11 Result of simulation (with case) i ijl ijl j
 BT  BT BT (2)
o w
4.2 Average Travel Time
We estimated the average travel time in each where,
zone. Fig. 12 shows the subtraction of the average i : present (without measure), w and absent (with
travel time of each zone in "with" and "without" measure), o
cases. The deeper a blue part, the bigger the BT : total travel time cost for case i (THB/(45
i
effectiveness gains the measure. In the case of "zone days)),
17", the travel time reduces about 20 minutes by the Q
implementation of the measure. ijl : traffic volume of case i, distance l of OD and
mode j (unit/day)
T ijl : travel time of case i, distance l of OD and mode
j (min)
a j : money cost of time for mode j (THB/min)

As a result, it was found that the measure
introduction would provide about 6.8 Mil-THB per
one and a half months in the rainy season.

5. Conclusion
In this study, we presented the road network
disruptions under the inundation each road section
by using the inundation data and result of traffic
Fig. 12 Comparison of travel time between “with” volume assignment. And then, the influence of urban
and “without” case floods on the road network in urban areas was
simulated by introducing the elevated arterial roads
4.3 Benefit of Travel Time Reduction as adaptation measure for the inundation sections.
In order to present the monetary value of the Finally, we clarified the impact of the adaptation
impact of the adaptation measure, we estimated the measures by using indicators such as the average
benefit of travel time reduction. In the cost-benefit travel time and the benefit of travel time reduction.
manual of the Ministry of Land, Infrastructure, As the results of the simulation, the travel time is
Transport and Tourism, Japan, this benefit is reduced by 20 minutes on average in the zones near
estimated using Equations (1) to (2). In equation (1), the river. Hence, it is revealed that 50% of the total
the total travel time cost for one year "with" or road network is affected by the inundation of floods.
"without" the measure is calculated by using the In addition, it was revealed the monetary value of the
traffic volume between the zones, the travel time and impact of the measures by calculating the cost
value of time. In this study, the value of time benefits of travel time reduction. Consequently, it
estimated by the Thai government agency (Office of was found that the benefit of travel time reduction
Transportation and Traffic Policy and Planning was estimated at 6.8 Mil-THB per one and a half
(OTP)) was used. In equation (2), the total travel months in every rainy season. In conclusion, in order

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