GRADUATE REPORT ON
ORIGIN & DESTINATION STUDY (TRANSPORTATION PLANNING-I) (CE-698 CE-698))
PREPARED BY AJAZ AHMED B. RAJ M.TECH-I, TRANSPORT TRANSPORTA ATION ENGINEERING AND PLANNING (ROLL NO : P11TP021)
† Content
Introduction
Purpose of O-D Study
Definition of the Study Area
Zoning
Surveys
† Introduction
Origin - Destination Why Origin & Destination Study is required ? Study area and Zoning Data collection Representation of Data Desired line diagram OD Matrix
† Purpose of O-D Study
Where they come from and where they go to?
To develop models is transport planning process
To assess the adequacy of the present highway system
To assess the adequacy of parking facilities and to plan for future
To determine the amount of by-passable traffic that enters a town
† Defining the Study Area
The study area for which transportation facilities area being planned is first of all defined
For planning at the urban level, the study area should embrace existing and potential built-up areas of the city
The external cordon line should be continuous and uniform in its course and the line should intersect roads where it is safe and convenient to carry out traffic surveys
The external cordon line should be compatible with previous studies
† Zoning
The purpose of such a sub-division is to facilitate the spatial quantification of land-use and economic factors which influence travel pattern
Sub-division into zones further helps in geographically associating the origins and destinations of travel
A convenient system of coding is adopted
Important points to be kept in view, while dividing the area into zones
- Land-use is the most important factor in establishing zones for accuracy. (residential, industrial, commercial, recreational, open space)
- The zones should have a homogeneous land-use so as to reflect accurately the associated trip-making behaviour
- Anticipated changes in land-use should be considered when sub-dividing the study area into zones - It would be advantageous if the Sub division follows closely that adopted by other bodies for data collection, thus will facilitate correlation of data
Important points to be kept in view, while dividing the area into zones
- The zones should not be too large to cause considerable errors in data. At the same time, they should not be too small either, to cause difficulty in handling and analysing the data - Zones should have regular geometric form for easily determining the centroid which represents the origin and termination of travel - Zones must be compatible with screen lines and cordon lines - Natural or physical barriers such as canals, railways, rivers etc. can form convenient zone boundaries
† Surveys
For large urban areas, the internal to internal travel is heavy whereas for small areas the internal to internal travel is insignificant.
The internal to internal travel is best studied by the home interview technique with checks by screen-line surveys. The internal-external, external-internal and external-external travels can be studied by cordon surveys
† Types of Survey
Home interview Road-side interview Commercial vehicle surveys Taxi surveys Post card questionnaire Registration number surveys Tag surveys Public transport surveys
† Home interview
Home-interview origin-destination survey is a method in which households were asked questions to get data on the travel pattern and the general characteristics influencing trip-making
The information on travel pattern includes number of trips made, their origin and destination, purpose of trip, travel mode, time of departure from origin and time of arrival at destination conducted on a daily basis
The information on household characteristics includes type of dwelling unit, number of residents, age, sex, vehicle ownership, whether he or she has a driver’s license, number of drivers, family income and so on
Based on these data it is possible to relate the amount of travel to household and develop equations for trip generation rates
† Home interview
Procedure for conducting Home interview is contained in the Bureau of Public Roads Manual, which precisely describes how the interview is to be conducted and what information is to be collected
It is impractical and unnecessary to interview all the residents of the study area. Since travel patterns tend to be uniform in a particular zone, so that proper sampling procedure is employed
Minimum Sampling Size for Home Interview Population of Study Area
Minimum Sample Size
Under 50,000
1 in 10 households
50,000 – 150,000
1 in 20 households
150,000 – 300,000
1 in 35 households
300,000 – 500,000
1 in 50 households
500,000 – 1,000,000
1 in 70 households
Over 1,000,000
1 in 100 households
