Data Collection and Inventories
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TRANSPORTATION TRANSPORTATION SYSTEM AND SYSTEM AND OPERATIONOPERATION
2 February 2013
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DATA COLLECTION DATA COLLECTION AND INVENTORIESAND INVENTORIES
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Before any planning occurs the Engineer must take what is known as an inventory of the area or if it is appropriate, the previous system in place. This inventory or database must include information on (1)population, (2)land use, (3)economic activity, (4)transportation facilities and services, (5)travel patterns and volumes, (6)laws and ordinances, (7)regional financial resources, (8)community values and expectations. These inventories help the engineer create business models to complete accurate forecasts of the future conditions of the system Review.
Designing the data collection survey for the transportation projects is not easy. It requires considerable experience, skill, and a sound understanding of the study area. It is also important to know the purpose of the study and details of the modeling approaches, since data requirement is influenced by these. Further, many practical considerations like availability of time and money also has a strong bearing on the survey design. In this section, we will discuss the basic information required from a data collection, defining the study area, dividing the areainto zones, and transport network characteristics.
SURVEY DESIGN
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Information needed:Typical information required from the data collection can be grouped into four categories
1. Socio-economic data:
Information regarding the socio-economic characteristics of the study area. This includes income, vehicle ownership, family size, etc. This information is essential in building trip generation and modal split models.
2. Travel surveys:
Origin-destination travel survey at households and traffic data from cordon lines and screen lines. Former data include the number of trips made by each member of the household, the direction of travel, destination, the cost of the travel, etc. The latter include the traffic flow, speed, and travel time measurements. These data will be used primarily for the calibration of the models, especially the trip distribution models.
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3. Land use inventory:This includes data on the housing density at residential zones, establishments at commercial and industrial zones. This data is especially useful for trip generation models.
4. Network data:
This includes data on the transport network and existing inventories. Transport network data includes road network, traffic signals, junctions etc. The service inventories include data on public and private transport networks. These particulars are useful for the model calibration, especially for the assignment models.
Once the nature of the study is identified, the study area can be defined to encompass the area of expected policy impact. The study area need not be confirmed by political boundaries, but bounded by the area influenced by the transportation systems. The boundary of the study area is defined as external cordon or simply the cordon line. Interactions with the area outside the cordon are defined via external stations which effectively serve as doorways to trips, into, out of, and through the study area. In short, study area should be defined such that majority of trips have their origin and destination in the study area and should be bigger than the area-of-interest covering the transportation project.
STUDY AREA:
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ZONING:Once the study area is defined, it is then divided into a number of small units called traffic analysis zones (TAZ) or simply zones. The zone within the study area are called internal zones, Zones are in modeling as if all their attributes and properties were concentrated in a single point called the zonecentroid. The centroids are connected to the nearest road junction or rail station by centroid connectors. Both centroid and centroid connectors are notional and it is assumed that all people have same travel cost from the centroid to the nearesttransport facility which is the average for a zone. The intersection from outside world is normally represented through external zones. The external zones are defined by the catchment area of the major transport links feeding to the study area. Although the list is not complete, few guidelines are given for selecting zones.
1. zones should match other administrative divisions, particularly census zones.2. zones should have homogeneous characteristics, especially in land use, population etc.3. zone boundaries should match cordon and screen lines, but should not match major roads.4. zones should be as smaller in size as possible so that the error in aggregation caused by the assumption that all activities are concentrated at the zone centroids is minimum.
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Transport network consists of roads, junctions, bus stops, rails, railway station etc. Normally road network and rail network are represented separately. Road network is considered as directed graph of nodes and links. Eachnode and links have their own properties. Road link is normally represented with attributes like starting node, ending node, road length, free flow speed, capacity, number of lanes or road width, type of road like divided or undivided etc. Road junctions or nodes are represented with attributes like node number, starting nodes of all links joining the current node, type of intersection (uncontrolled, round about, signalized, etc.). Similarly public transport network like bus transit network and rail network are represented, but with attributes relevant tothem. These may include frequency of service, fare of travel, line capacity, station capacity etc. This completes the inventory of base-year transportation facility.
NETWORK:
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HOUSEHOLD DATA
To understand the behavior and factors affecting the travel, one has got the origin of travel when the decision for travel is made. It is where people live as family which is the household. Therefore household data is consideredto be the most basic and authentic information about the travel pattern of a city. Ideally one should take the details of all the people in the study to get complete travel details. However, this is not feasible due to large requirement of time and resources needed. In addition this will cause diffculties in handling these large data in modeling stage. Therefore, same sample households are randomly selected and survey is conducted to get the household data. Higher sample size is required for large population size, and vice-versa. Normally minimum ten percent samples are required for population less than 50,000. 5 but for a population more than one million require only one percent for the same accuracy.
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QUESTIONNAIRE DESIGNA good questionnaire design will ensure better response from the respondent and will significantly improve the quality of data. Design of questionnaire is more of an art than a science. However few guiding principles can be laid out. The questionnaire should be simple, direct, should take minimum time, ans should cause minimum burden to the respondent. Traditional household survey hasthree major sections; household characteristics, personal characteristics, and trip details.
Household characteristics
This section includes a set of questions designed to obtain socioeconomicinformation about the household.
Personal characteristicsThis part includes questions designed to classify the household members.
Trip dataThis part of the survey aims at detecting and characterizing all trips made by the household members identified in the first part.
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SURVEY ADMINISTRATION
the next step is to conduct the actual survey with the help of enumerators. Enumerators has to be trained first by briefing them about the details of the survey and how to conduct the survey. They will be given random household addresses and the questionnaire set. They have to first get permission to be surveyed from the household. They may select a typical working day for the survey and ask the members of the household about the details required in the questionnaire. They may take care that each member of the household should answer about their own travel details, except for children below 12 years. Trip details of children below 5 years are normally ignored. Since the actual survey may take place any time during the day, the respondents are required to answer the question about the travel details of the previous day.
- There are many methods of the administration of the survey and some of them are:
The enumerator may use telephone to x an appointment and then conduct detailed telephonic interview. This is very popular in western countries where phone penetration is very high.
1. Telephonic:
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The enumerator drops the questionnaire to the respondent and asks them to fill the details and mail them back with required information. Care should be taken to design the questionnaire so that it is self explanatory.
2. Mail back:
In this method, the enumerator visits the home of the respondent and asks the questions and fills up the questionnaire by himself. This is not a very socially acceptable method in the developed countries, as these are treated as intrusion to privacy. However, in many developed countries, especiallywith less educated people, this is the most effective method.
3. Face-to-face
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DATA PREPARATION
The raw data collected in the survey need to be processed before direct application in the model. This is necessary, because of various errors, except in the survey both in the selection of sample houses as well as error in filling details. In this section, we will discuss three aspects of data preparation; data correction, data expansion, and data validation.
Data correction
1. Household size correctionIt may be possible that while choosing the random samples, one may choose either larger or smaller than the average size of the population as observed in the census data and correction should be made accordingly.
2. Socio-demographic corrections
It is possible that there may be differences between the distributionof the variables sex, age, etc. between the survey, and the population as observed from the census data. This correction is done after the household size correction.
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3. Non-response correction
It is possible that there may not be a response from many respondents,possible because they are on travel everyday. Corrections should be made to accommodate this, after the previous two corrections.
4. Non-reported trip correction
In many survey people underestimate the non-mandatory trips and theactual trips will be much higher than the reported ones. Appropriate correction need to be applied for this.
Sample expansionThe second step in the data preparation is to amplify the survey data in order to represent the total population of the zone. This is done with the help of expansion factor which is defined as the ratio of the total number of household addressed in the population to that of the surveyed. A simple expansion factor Fi for the zone i could be of the following form.Fi = a / (b-d)where a is the total number of household in the original population list, b is the total number of addresses selected as the original sample, and d is the number of samples where no response was obtained.
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Sample expansionThe second step in the data preparation is to amplify the survey data in order to represent the total population of the zone. This is done with the help of expansion factor which is defined as the ratio of the total number of household addressed in the population to that of the surveyed. A simple expansion factor Fi for the zone i could be of the following form.
Fi = __a__b - d
where a is the total number of household in the original population list, b is the total number of addresses selected as the original sample, and d is the number of samples where no response was obtained.
Validation of results
In order to have confidence on the data collected from a sample population, three validation tests are adopted usually. The first simply considers the consistency of the data by a field visit normally done after data entry stage. The second validation is done by choosing a computational check of the variables. For example, if age of a person is shown some high unrealistic values like 150 years. The last is a logical check done for the internalconsistency of the data. For example, if the age of a person is less than 18 years, then he cannot have a driving license. Once these corrections are done, the data is ready to be used in modeling.
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Validation of results
In order to have confidence on the data collected from a sample population, three validation tests are adopted usually. The first simply considers the consistency of the data by a field visit normally done after data entry stage. The second validation is done by choosing a computational check of the variables. For example, if age of a person is shown some high unrealistic values like 150 years. The last is a logical check done for the internal consistency of the data. For example, if the age of a person is less than 18 years, then he cannot have a driving license. Once these corrections are done, the data is ready to be used in modeling.
Other surveysIn addition to the household surveys, these other surveys are needed for complete modeling involving four stage models. Their primary use is for the calibration and validation of the models, or act as complementary to thehousehold survey. These include O-D surveys, road side interviews, and cordon and screen line counts.
Sometime four small studies, or to get a feel of the O-D pattern without doing elaborate survey, work space interviews are conducted to find the origin-destination of employers in a location. Although they are biased interms of the destination, they are random in terms of the mode of travel.
1. O-D survey
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2. Road side interviewsThese provide trips not registered in a household survey, especially external-internal trips. This involves asking questions to a sample of drivers and passengers of vehicles crossing a particular location. Unlike householdsurvey, the respondent will be asked with few questions like origin, destination, and trip purpose. Other information like age, sex, and income can also be added, but it should be noted that at road-side, drivers willnot be willing to spend much time for survey.
These provide useful information about trips from and to external zones. For large study area, internal cordon line can be defined and surveying can be conducted. The objective of the survey is primarily to collect the origin and destination zones and for this many suitable methods can be adopted. It could be either recording the license plate number at all the external cordon points or by post-card method. 5 Screen lines divide the study area into large natural zones, like either sides of a river, with few crossing pointsbetween them. The procedure for both cordon-line and screen-line survey are similar to road-side interview. However, these counts are primarily used for calibration and validation of the models.
3. Cordon and screen-line survey
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THANK YOU!
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Spreading and compaction not done by layer
BASE PREPARATION
Longos Bridge
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Improper curing
CONCRETE PAVING
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Use of wooden forms
CONCRETE PAVING
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Use of wooden forms
CONCRETE PAVING
Const. of San Fernando Br. #1 and Approaches Along DM Jct.-Legaspi- Sto. Domingo- Tabaco-Tiwi-Cam Sur Bdry Road
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Occurrence of transverse crack within 1.5m from
the weakened plane joint
CONCRETE PAVEMENT DEFECT
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Baguio – Itagon Road
Occurrence of transverse crack within 1.5m from
the weakened plane joint
CONCRETE PAVEMENT DEFECT
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Longitudinal crack due to base failure
CONCRETE PAVEMENT DEFECT
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Concreting of Quezon – Aramaywan Road
Longitudinal crack due to base failure
CONCRETE PAVEMENT DEFECT
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Major scaling due to poor quality of
concrete mix and/or aggregates
CONCRETE PAVEMENT DEFECT
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Baguio – Itagon Road
Major scaling due to poor quality of
concrete mix and/or aggregates
CONCRETE PAVEMENT DEFECT
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Honeycombs due to poor
consolidation of concrete mix
CONCRETE PAVEMENT DEFECT
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Upgrading (Asphalt to Concrete) of Damaged Paved National Road, Usom, Masbate
Honeycombs due to poor
consolidation of concrete mix
CONCRETE PAVEMENT DEFECT
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Poor application of asphalt sealant on
pavement joints
CONCRETE PAVEMENT DEFECT
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Road Upgrading (Gravel to Paved) of Jct. Ipil-Quirino Bdry. Road
Poor application of asphalt sealant on
pavement joints
CONCRETE PAVEMENT DEFECT
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Plastering of concrete curb and gutter
CONCRETE PAVEMENT DEFECT
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Rehab/Widening of Roads along Manila East Road (Rosario-Cainta Road)
Plastering of concrete curb and gutter
CONCRETE PAVEMENT DEFECT
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Gap between manhole cover and angular frame work
support
DRAINAGE CONSTRUCTION
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Rehab/widening of Roads and Improvement of Drainage System along Manila East road (Rosario-Cainta Road)
Gap between manhole cover and angular frame work
support
DRAINAGE CONSTRUCTION
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Manhole cover not levelled with the
sidewalk top surface
DRAINAGE CONSTRUCTION
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Improvement/Widening of C.P. Garcia Avenue
Manhole cover not levelled with the
sidewalk top surface
DRAINAGE CONSTRUCTION
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Washed-out mortar grout facing on the
grouted riprap
POOR CONSTRUCTION
PRACTICES
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Use of backhoe instead of vibro hammer in driving of
steel sheet piles
PILE DRIVING
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Application of thermoplastic
pedestrian pavement markings
GOOD MAINTENANCE PRACTICES
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Application of thermoplastic
pedestrian pavement markings
Casisang Section, Malaybalay
GOOD MAINTENANCE PRACTICES
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Provision of side ditching
GOOD MAINTENANCE PRACTICES
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Provision of side ditching
Jct. Sayre Highway Aglayan-Basak Road
GOOD MAINTENANCE PRACTICES
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Vegetation control along road shoulders
GOOD MAINTENANCE PRACTICES
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Vegetation control along road shoulders
Jct. Sayre Highway Aglayan-Basak Road
GOOD MAINTENANCE PRACTICES
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Reshaping of unpaved shoulder
GOOD MAINTENANCE PRACTICES
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Reshaping of unpaved shoulder
Cordon – Aurora Boundary Road
GOOD MAINTENANCE PRACTICES
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Seal coating of pavement with
raveling
GOOD MAINTENANCE PRACTICES
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Seal coating of pavement with
raveling
Cordon – Aurora Boundary Road
GOOD MAINTENANCE PRACTICES
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Provision of bridge name, load limit sign and zebra painting
GOOD MAINTENANCE PRACTICES
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Uncompacted and inverted road
shoulder
POOR MAINTENANCE PRACTICES
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Uncompacted and inverted road
shoulder
Taytay El Nido Road
POOR MAINTENANCE PRACTICES
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Squaring was not undertaken prior to
asphalt patching
POOR MAINTENANCE PRACTICES
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Low shoulders
POOR MAINTENANCE PRACTICES
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Non provision of centerline and
edgeline pavement markings
POOR MAINTENANCE PRACTICES
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Non-removal of shrubs on bridge expansion joints
POOR MAINTENANCE PRACTICES
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Non-removal of spoil materials
POOR MAINTENANCE PRACTICES
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Good Practiceson
Road Safety
Proper LaneDelineation
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Proper LaneDelineation
Good Practiceson
Road Safety
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Manila East Road, Rizal
Proper LaneDelineation
Good Practiceson
Road Safety
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Road Signs andGuardrails on
Curves
Good Practiceson
Road Safety
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Proper LaneDelineation
Good Practiceson
Road Safety
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Julia Vargas Road, Pasig
Proper LaneDelineation
Good Practiceson
Road Safety
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Provision ofAdequate Shoulders
Good Practiceson
Road Safety
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Manila East Road, Rizal
Provision ofAdequate Shoulders
Good Practiceson
Road Safety
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Proper Markingson BridgeApproach
Good Practiceson
Road Safety
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Bonifacio Global City, Taguig
Proper Markingson BridgeApproach
Good Practiceson
Road Safety
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Proper DirectionalMarkings
Good Practiceson
Road Safety
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Bonifacio Global City, Taguig
Proper DirectionalMarkings
Good Practiceson
Road Safety
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Bad Practiceson
Work ZoneSafety
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Dapitan-Dakak Road Section
Bad Practiceson
Work ZoneSafety
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DirectionalSigns too low and
close to thejunction/blocking
other signs
Bad Practiceson
Road Safety
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Olongapo-Bugallon Road
DirectionalSigns too low and
close to thejunction/blocking
other signs
Bad Practiceson
Road Safety
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Road Safety Devices not in
Accordance with Road Safety
Design Standards
Bad Practiceson
Road Safety
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Manila East Road, Infanta, Quezon
Road Safety Devices not in
Accordance with Road Safety
Design Standards
Bad Practiceson
Road Safety
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Dangerous curve on a cliff without
roadside safety barriers and hazard
markers
Bad Practiceson
Road Safety
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Baguio-Bontoc Road
Dangerous curve on a cliff without
roadside safety barriers and hazard
markers
Bad Practiceson
Road Safety
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Cats’ Eyes used for traffic calming
Bad Practiceson
Road Safety
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Baguio-Bontoc Road
Cats’ Eyes used for traffic calming
Bad Practiceson
Road Safety
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Open lined canal pose as hazard to
vehicles and pedestrians
Bad Practiceson
Road Safety
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Manila East Road, Rizal
Open lined canal pose as hazard to
vehicles and pedestrians
Bad Practiceson
Road Safety
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Commercial ads compete with
direction signs
Bad Practiceson
Road Safety
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Tarlac-Nueva Ecija Road
Commercial ads compete with
direction signs
Bad Practiceson
Road Safety
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RECOMMENDATIONSFor Better Quality and Safer Roads
Preliminary & Detailed Engineering
• Seminar on pavement analysis and design road drainage design and slope protection
• Seminar on roadside design
Methods of Construction
• Use of slip form concrete paver with cutting and brooming capabilities (including amendment to D.O. No. 1, series of 2012)
• Use of CTB on roads with high ESAL• Use of pre-fabricated curb and gutter and curb inlet and manhole• Use of polymer modified bitumen (PMB) in asphalt and overlaying
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RECOMMENDATIONSFor Better Quality and Safer Roads
Institutional
• Accreditation of DPWH Materials Engineers• Training of DPWH plant inspectors (asphalt and concrete batching
plants)• Mete sanctions against erring Contractor’s Project/Materials
Engineers
Maintenance
• Re-training of maintenance crews• Procurement of appropriate road maintenance equipment (concrete
cutter, plate compactors, kneading machines, asphalt kettle, pressurized nozzles, etc. )
• Stricter implementation of D.O. 13, s of 2011 re: Revised Guidelines on the Maintenance of National Roads and Bridges
• Inclusion of pavement markings in regular maintenance program• Adopt performance-based maintenance contracts
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RECOMMENDATIONSFor Better Quality and Safer Roads
Safety
• Training on Road Safety Audit and application of Road Safety Design Manual
• Expand coverage of iRAP activities• Implement iRAP recommendations