Page 117 - 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

namely (1) encountering a heavy rainfall just before No Trip Circumstance Options
the trip, (2) encountering a heavy rainfall during the purpose 189,000 43
trip, (3) encountering a road flood just before the VND minutes
trip, and (4) encountering a road flood during the Heavy rain just 19,000 62
trip. For each trip purpose (e.g.., commuting, 4 Other before departure bus VND minutes
mc taxi 112,000
42
shopping, leisure, and other), each respondent is time VND minutes
given a number of choices, including (1) cancelation, Fig. 2 A sample questionnaire in the stated
(2) postponement, (3) destination change, (4) route adaptation survey
change, (5) mode change to car, motorcycle, bicycle, 3.3 Analytical framework
e-bike, and bus, and (6) no change. Only rainfall The analysis in this paper includes three
which has the average intensity of at least 50 mm/h parts. In the first part, change patterns were
and last for at least 1 hour; and flooding which has comparatively analyzed by trip purpose, namely
the depth of over 2/3 motorcycle wheel and the commuting trips, shopping trips, and leisure trips.
length of over 50 m are investigated in this survey. The second part was attempted to test hypotheses
About 400 respondents were successfully that the weather might determine the likelihood of a
interviewed, including 160 motorcyclists and e-bike change in travel behavior and changes in travel
riders, 80 car drivers, 80 bus riders and 80 cyclists. behavior because of weather conditions might be
To ensure an optimal correspondence between the associated with trip characteristics (such as purpose)
surveyed samples and the actual population, the and personal characteristics. The Pearson chi-square
sample were weighted. The observations were independence tests were deployed for the hypothesis
weighted to match the sample distribution and the test. In the third part, patterns of mode change were
population distribution. analyzed and binary logit model was deployed to
3.2 Stated adaptation survey analyze the mode choice decision-making
Each respondent was presented with two mechanism as stated by individuals or road users.
options of mode use in a hypothetical situation for The results of the descriptive analysis and the tests
making a choice – combinations of trip purpose, are presented in the following chapters.
circumstance, and trip cost and trip time (see Figure
3). There are four trip purposes considered, 4. Results
including commuting, shopping, leisure and others. 4.1 Patterns of behavioral change by trip
There are 6 types of circumstance taken into account, purpose
namely (1) heavy rain just before moving, (2) heavy The results are presented in Table 1. Change
rain encountered during moving, (3) road flooding patterns were comparatively examined for three trip
just before moving, (4) road flooding encountered purposes, including commuting (C), shopping (S),
during moving, (5) congestion due to heavy rain and and leisure (L). For commuting trips, while changes
road flooding just before moving, (6) congestion due in departure time are common to both heavy rain and
to heavy rain and road flooding encountered during flood, changes in route are common to flood only.
moving. There are seven transport modes used in Postponing the trip to a later moment is especially a
choice experiment, including car, motorcycle, common practice; more than three persons in ten
bicycle, e-bike, bus, taxi and motorcycle taxi (xe would postpone their trips in case of heavy rain
om). About 100 respondents were successfully and/or flood. Almost half of the respondents
interviewed, including 70 motorcyclists, 15 car changed the route in case of flood. Such changes can
drivers and 15 bus passengers. be explained by the fact that people try to avoid
Which option do you like to choose in each of the traffic jams and to be safe while traveling by
following scenarios? (Please tick in before the answer option!)
Trip changing the route and the departure time. Since
No Circumstance Options
purpose work or school location is unchangeable, very low
26,000 36
percentages of the respondents changed the
Road flood VND minutes
1 Commuting motorcycle
during the trip 192,000 28 destination. Because the available or accessible
taxi
VND minutes modes are limited, few percentages of the
13,000 18
Congestion just respondents changed mode. However, changes in
2 Shopping before departure motorcycle VND minutes destination would be more feasible if telecommuting
14
100,000
time taxi
VND minutes alternatives, satellite offices, and e-learning are

Congestion 38,000 52 available. The most prevalent changes in commuting
3 Leisure motorcycle
during the trip VND minutes
car trips are changes in the departure time and changes
92