Topic
Trip generation
About: Trip generation is a research topic. Over the lifetime, 1979 publications have been published within this topic receiving 32095 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: In this article, the authors describe the design of an agent-based model for shared autonomous vehicle (SAV) operations, the results of many case-study applications using this model, and the estimated environmental benefits of such settings, versus conventional vehicle ownership and use.
Abstract: Carsharing programs that operate as short-term vehicle rentals (often for one-way trips before ending the rental) like Car2Go and ZipCar have quickly expanded, with the number of US users doubling every 1–2 years over the past decade. Such programs seek to shift personal transportation choices from an owned asset to a service used on demand. The advent of autonomous or fully self-driving vehicles will address many current carsharing barriers, including users’ travel to access available vehicles. This work describes the design of an agent-based model for shared autonomous vehicle (SAV) operations, the results of many case-study applications using this model, and the estimated environmental benefits of such settings, versus conventional vehicle ownership and use. The model operates by generating trips throughout a grid-based urban area, with each trip assigned an origin, destination and departure time, to mimic realistic travel profiles. A preliminary model run estimates the SAV fleet size required to reasonably service all trips, also using a variety of vehicle relocation strategies that seek to minimize future traveler wait times. Next, the model is run over one-hundred days, with driverless vehicles ferrying travelers from one destination to the next. During each 5-min interval, some unused SAVs relocate, attempting to shorten wait times for next-period travelers. Case studies vary trip generation rates, trip distribution patterns, network congestion levels, service area size, vehicle relocation strategies, and fleet size. Preliminary results indicate that each SAV can replace around eleven conventional vehicles, but adds up to 10% more travel distance than comparable non-SAV trips, resulting in overall beneficial emissions impacts, once fleet-efficiency changes and embodied versus in-use emissions are assessed.
1,205 citations
TL;DR: In this article, the effects of land use and attitudinal characteristics on travel behavior for five diverse San Francisco Bay Area neighborhoods were examined, and the finding that attitudes are more strongly associated with travel than are land use characteristics suggests that land use policies promoting higher densities and mixtures may not alter travel demand materially unless residents' attitudes are also changed.
Abstract: This study examined the effects of land use and attitudinal characteristics on travel behavior for five diverse San Francisco Bay Area neighborhoods. First, socio-economic and neighborhood characteristics were regressed against number and proportion of trips by various modes. The best models for each measure of travel behavior confirmed that neighborhood characteristics add significant explanatory power when socio-economic differences are controlled for. Specifically, measures of residential density, public transit accessibility, mixed land use, and the presence of sidewalks are significantly associated with trip generation by mode and modal split. Second, 39 attitude statements relating to urban life were factor analyzed into eight factors: pro-environment, pro-transit, suburbanite, automotive mobility, time pressure, urban villager, TCM, and workaholic. Scores on these factors were introduced into the six best models discussed above. The relative contributions of the socio-economic, neighborhood, and attitudinal blocks of variables were assessed. While each block of variables offers some significant explanatory power to the models, the attitudinal variables explained the highest proportion of the variation in the data. The finding that attitudes are more strongly associated with travel than are land use characteristics suggests that land use policies promoting higher densities and mixtures may not alter travel demand materially unless residents' attitudes are also changed.
1,034 citations
Book•
21 Jun 2007
TL;DR: In this paper, the authors present an overview of the road surface design and traffic flow analysis in the context of road surface repair and reconstruction. But they do not consider the impact of road conditions on the overall road surface.
Abstract: PART 1 - INTRODUCTION. 1. The Profession of Transportation Engineering - Importance of Transportation. Transportation History. Transportation Employment. Summary. Problems. References. 2. Transportation Systems and Organizations - Developing a Transportation System. Modes of Transportation. Transportation Organizations. Summary. Problems. References. PART 2 - TRAFFIC OPERATIONS. 3. Characteristics of the Driver, the Pedestrian, the Vehicle, and the Road - Driver Characteristics. Perception-Reaction Process. Older Drivers' Characteristics. Pedestrian Characteristics. Bicyclists and Bicycles Characteristics. Vehicle Characteristics. Road Characteristics. Summary. Problems. References. 4. Traffic Engineering Studies - Spot Speed Studies. Volume Studies. Travel Time and Delay Studies. Parking Studies. Summary. Problems. References. 5. Highway Safety - Issues Involved in Transportation Safety. Strategic Highway Safety Plans. Effectiveness of Safety Design Features. Summary. Problems. References. 6. Fundamental Principles of Traffic Flow - Traffic Flow Elements. Flow-Density Relationships. Shock Waves in Traffic Streams. Gap and Gap Acceptance. Introduction to Queuing Theory. Summary. Problems. 7. Intersection Design - Types of At-Grade Intersections. Design Principles for At-Grade Intersections. Design of Railroad Grade Crossings. Summary. Problems. References. 8. Intersection Control - General Concepts of Traffic Control. Conflict Points at Intersections. Types of Intersection Control. Signal Timing for Different Color Indications. Freeway Ramps. Summary. Problems. References. 9. Capacity and Level of Service: Two-Lane and Multilane Highways - Two-Lane Highways. Freeways. Multilane highways. Summary. Problems. References. Appendix: Tables. 10. Capacity and Level of Service at Signalized Intersections - Definitions of Some Common Terms. Level of Service at Signalized Intersections. Summary. Problems. References. Appendix:Tables. PART 3 - TRANSPORTATION PLANNING. 11. The Transportation Planning Process - Basic Elements of Transportation Planning. Transportation Planning Institutions. Urban Transportation Planning. Forecasting Travel. Summary. Problems. References. 12. Forecasting Travel Demand - Demand Forecasting Approaches. Trip Generation. Trip Distribution. Mode Choice. Traffic Assignment. Other Methods for Forecasting Demand. Estimating Freight Demand. Traffic Impact Studies. Summary. Problems. References. 13. Evaluating Transportation Alternatives - Basic Issues in Evaluation. Evaluation Based on Economic Criteria. Evaluation Based on Multiple Criteria. Summary. Problems. References. PART 4 - LOCATION, GEOMETRICS, AND DRAINAGE. 14. Highway Surveys and Location - Principles of Highway Location. Highway Survey Methods. Highway Earthwork and Final Plans. Summary. Problems. References. 15. Geometric Design of Highway Facilities - Factors Influencing Highway Design. Design of the Alignment. Special Facilities for Heavy Vehicles on Steep Grades. Bicycle Facilities. Parking Facilities. Computer Use in Geometric Design. Summary. Problems. References. 16. Highway Drainage - Surface Drainage. Highway Drainage Structures. Sediment and Erosion Control. Hydrologic Considerations. Unit Hydrographs. Hydraulic Design of Highway Drainage Structures. Subsurface Drainage. Economic Analysis. Summary. Problems. References. Additional Readings . HPART 5 - MATERIALS AND PAVEMENTS. 17. Soil Engineering for Highway Design - Soil Characteristics. Basic Engineering Properties of Soils. Classification of Soils for Highway Use. Soil Surveys for Highway Construction. Soil Compaction. Special Soil Tests for Pavement Design. Frost Action in Soils. Summary. Problems. References. 18. Bituminous Materials - Sources of Asphalt. Description and Uses of Bituminous Binders. Properties of Asphalt Materials. Tests for Asphalt Materials. Asphalt Mixtures. Superpave Systems. Summary. Problems. References . 19. Design of Flexible Pavements - Structural Components of a Flexible Pavement. Soil Stabilization. General Principles of Flexible Pavement Design. Summary. Problems. References. 20. Design of Rigid Pavements - Materials Used in Rigid Pavements. Joints in Concrete Pavements. Types of Rigid Highway Pavements. Pumping of Rigid Pavements. Thickness Design of Rigid Pavements. Summary. Problems. References. 21. Pavement Management - Problems of Highway Rehabilitation. Methods for Determining Roadway Condition. Pavement Condition Prediction. Pavement Rehabilitation. Pavement Rehabilitation Programming. GIS and Pavement Management. Summary. Problems. References. Appendixes. Index.
710 citations
5 Apr 2001
TL;DR: In this article, the authors look into the premise of urban design and transportation planning and seek to answer three questions: Can it work, will it be put into practice, and Is it a good idea?
Abstract: Combining urban design and transportation planning with the idea that neighborhoods and cities can be designed to change travel behavior is a popular idea. The goal is to reduce car use and increase the quality of life in the neighborhood. This book looks into the premise of urban design and transportation planning. It seeks to answer three questions: Can it work, Will it be put into practice, and Is it a good idea? The book is divided into four parts: an introduction, a section on travel behavior, a section on the supply of place, and a section on the role of travel by design. Topics include traffic, urban form, travel, demand for travel, a study of travel behavior, neighborhood supply, mathematical models for trip generation, transit-oriented planning, and a case study of planning.
634 citations
TL;DR: In this article, the authors used travel diary data for southern California residents to examine the link between land-use patterns at the neighbourhood level and non-work trip generation for a sample of 769 individuals.
Abstract: Planners are increasingly viewing land-use policy as a way to manage transport demand. Yet the evidence on the link between land use and travel behaviour is inconclusive. This paper uses travel diary data for southern California residents to examine the link between land-use patterns at the neighbourhood level and non-work trip generation for a sample of 769 individuals. The number of non-work automobile trips that an individual makes in a two-day period is modelled as a function of socio-demographic variables and land-use characteristics near the person's place of residence. The land-use variables are statistically insignificant in all but one of the specifications. The results suggest that choices about how to measure the variables and how to specify the regressions can influence the conclusions from these studies in potentially important ways. This underscores the need for continued careful attention to these research issues.
603 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 8 |
| 2024 | 13 |
| 2023 | 18 |
| 2022 | 37 |
| 2021 | 74 |
| 2020 | 40 |