| Author | Kugathas, Namasivayam |
| Call Number | AIT Thesis no.GT-89-26 |
| Subject(s) | Transportation--Planning--Mathematical models
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-89-26 |
| Abstract | The estimation of trip matrix is an essential component
in transportation planning. But, t his involves large scale
survey and cost , which a developing country cannot afford.
Therefore , it would b e useful to develop a mode l wl1i c h is
flexible for the limited traffic flow data and could
trade off accuracy to the extent of avail able data. Such an
a n a lysis would facilitate a planner who is constraint to
estimate the trip matrix under the financial limitations.
Presently , interest has been evinced in formulating combined
distribution - assignment mode l s (CDA ) , u sing feed back
effect between trip distribution a nd traffic assignment.
Such models are preferred , because they are not much
affected by the assignment model specification . However , the
complexity in solving a general case , lead to make different
hypothesis and various formulation of CDA mode l s.
In this study, a Combined Incremental Distribution
Assignment (CIDA ) model is proposed , which assumes less
abrupt changes in the trip pattern. The pro posed heuristic
model updates old trip matrix through a step - by - step
increment, using traffic flow data. Therefore, when the
traffic flow data is limited, the additional information
would b e provided from the old trip matrix. Using t h is
flexibility, the accuracy variation was analyzed for the
limited amounts of traffic flow data. This analysis was
carried out on three different imaginary Network
configurations , namely grid type, radial type and
baiterzen type.
The results showed the similar trend in all three cases
studied. This analysi s was extended to study the trade - off
situation between cost and accuracy u sin g an assumed cost
function. The convexity of the mode l was satisfactory during
these tests.
Since , personal computers are abundantly available now,
a computer program was developed to b e compatible with micro
computers. But, such programs have limitations in capacity.
As such the program developed did not permit for extensive
analysis. However , the results suggest that this heuristic
model could be developed as a good planning tool . Future
research may focus o n designing a nd assembling a suitable
data set that ca n be used for extensive tests on this
heuristic model and for comparisons of t h is mode l with other
existing trip matrix estimation models. |
| Year | 1990 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-89-26 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Fukuda, Atsushi; |
| Examination Committee(s) | Kuroda, Koji ;YORDPHOL TANABORIBOON; |
| Scholarship Donor(s) | The Federal Republic of Germany (DAAD ) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |