working paper

The Household Activity Pattern: General Formulation and Solution

Publication Date

April 30, 1995

Author(s)

Abstract

The household activity pattern problem of analyzing/predicting the optimal path of household members through time and space as they complete a prescribed agenda of out-of-home activities is posed as a variant of the pickup and delivery problem with time windows. The most general case of the model includes provision for vehicle transfer, selective activity participation, and ridesharing options. A series of examples are solved using generic algorithms. The model is purported to remove existing barriers to the operationalization of activity-based approaches in travel behavior analysis.

working paper

Highways and Intrametropolitan Employment Growth

Publication Date

March 31, 1995

Author(s)

Abstract

This paper examines the link between highways and employment growth within two metropolitan areas. Most studies of the land use impacts of transportation focus on residential location. yet in decentralized urban areas, the relationship between the highway network and intrametropolitan employment location is an important one. This paper uses an econometric model of local employment growth to examine the effect of highways on employment changes within northern New Jersey and Orange County, California. Within both urban areas, highway proximity has a statistically significant and positive effect on employment growth. There is also evidence that other location specific amenities (such as agglomeration economies and surrounding population growth) are possibly more important for local employment growth than highway location.

working paper

Modeling the Choice of Telecommuting 3: Identifying the Choice Set and Estimating Binary Choice Models for Technology-Based Alternatives

Publication Date

February 28, 1995

Author(s)

Patricia (Pat) Mokhtarian

Abstract

Previous papers in this series have presented a conceptual model of the individual decision to telecommute and explored relationships among constraints, preference, and choice. A related paper has developed a binary model of the preference for home-based telecom- muting. Noting that there is a wide gap between preferring to telecommute (88% of the sample) and actually telecommuting (13%), this paper develops binary logit models of role- commuting adoption. Two approaches to dealing with constraints are compared: incorporating them directly into the utility function, and using them to define the choice set. Models using the first approach appear to be statistically superior in this analysis, explaining 63-64% of the information in the data. Variables significant to choice include those relating to work and travel drives, and awareness, manager support, job suitability, technology, and discipline constraints. The best model was used to analyze the impact of relaxing three key constraints on the 355 people in the sample for whom telecommuting was previously identified to be a Preferred Impossible Alternative. When unawareness, lack of manager support, and job unsuitability constraints are relaxed, 28% of the people in the PIA category would be expected to adopt telecommuting. The importance of behavioral models to accurately forecasting telecommuting adoption is emphasized and is suggested to have wider implications for predicting technology-based activity changes.

working paper

L.A. Story: A Reality Check for Transit-Based Housing

Abstract

An increasingly influential planning strategy for leveraging rail transit is high-density residential development near rail stations, or ‘Transit-Based Housing’. Proponents argue such projects will get more people onto trains, reduce developers’ expenses, and lower commuting costs, housing prices, and air pollution in the bargain. While most of the literature has addressed the merit of such projects, this paper considers a separate question: Whatever virtues transit-based housing may have, what are its prospects?

We find that transit-based housing faces a much steeper uphill battle than the conventional wisdom suggests. Cities’ parochial fiscal and economic interests appear to conflict with transit-based housing in several fundamental respects, a view strongly supported by a behavioral analysis of zoning data for all 232 existing and proposed Southern California rail transit stations. Municipalities behave as if they prefer to use rail transit stations for economic rather than residential development, suggesting that transit oriented planning strategies would profit form more attention to their local fiscal and economic benefits.

working paper

Transportation Infrastructure, Economic Productivity, and Geographic Scale: Aggregate Growth versus Spatial Redistribution

Publication Date

January 31, 1995

Author(s)

Abstract

Recent cross-state studies of public infrastructure suggest that infrastructure is not economically productive. Yet it is possible that public capital influences economic activity largely by shifting that activity from one location to another. If that is the case, infrastructure can be productive at small geographic scales but not productive over large areas. This paper tests that hypothesis with a production function study of highway and road capital in California counties for the years 1969 through 1988. The results show that county output is positively associated with highway capital in the county, but negatively associated with highway capital in neighboring counties. This suggests that the productive effects of highway capital are largely a shift in economic activity from one county to another.

working paper

Commercial Fleet Demand for Alternative-Fuel Vehicles: Results From a Stated-Choices Survey of 2,000 Fleet Operators in California

Abstract

Although it is widely recognized that fleets are critical to the growth of alternative fuel technologies, survey data needed to develop fleet demand models have been generally unavailable prior to 1994, due to the difficulty of establishing a representative sample of both business and government organizations with fleet operations. The current study provides results from a large, broad-based sample of fleet sites in California, part of a broader project to develop an integrated vehicle demand forecasting system for both households and fleets (Brownstone, et al., 1994). The 1994 California Fleet Site Survey was based on a comprehensive sample derived from motor-vehicle registration records, and a survey response rate in excess of 70% was obtained.

Initial results from the 1994 California Fleet Site Survey are explored In this paper. The paper is organized as follows: Previous research is discussed in Section 2, followed by a description of the survey in Section 3. Fleet site characteristics are explored in Section 4. Vehicle utilization is analyzed in Section 5, and the effects of fleet operators’ awareness of clean fuel mandates is explored in Section 6. Nearterm AFV purchase intention is examined in Section 7. A model of vehicle choice is presented in Section 8 to provide insights into the attribute tradeoffs that fleet managers are likely to exhibit when making future vehicle acquisitions in the presence of AFV’s. Finally, the conclusions drawn to date are reported in Section 9.

working paper

Travel-Time Uncertainty, Departure Time Choice, and the Cost of the Morning Commute

Publication Date

December 31, 1994

Abstract

We extend existing models of the commuting time-of-day choice in order to analyze the effect of uncertain travel times. Travel time includes a time-varying congestion component and a random element specified by a probability distribution. We compare results from the uniform and exponential probability distributions and derive the optimal “head start” time that the commuter chooses to account for travel time variability; i.e., a safety margin that determines the probability of arriving late for work. Our model includes a one-time lateness penalty for arriving late as well as the per minute penalties for early and late arrival that other investigators have included. It also generalizes earlier work by accounting for the time variation in the predictable component of congestion, which interacts with uncertainty in interesting ways. A brief numerical analysis of the model reveals that uncertainty can account for a large proportion of the costs of the morning commute.

working paper

Clean on Paper, Dirty on the Road: Troubles with California's Smog Check

Abstract

Reducing emissions of pollutants from cars requires that new vehicles be designed and built to pollute less, and also requires some ongoing inspection and maintenance programme to ensure that a vehicle’s operation conforms to those design standards. This paper focuses on these programmes, commonly called Smog Check programmes. The most extensive and well-studied Smog Check programme in the United States is in California. Though that state is not typical in all respects, examining its experience is instructive.

working paper

On the Costs of Air Pollution from Motor Vehicles

Publication Date

December 31, 1994

Abstract

Air pollution is frequently the stated reason for special measures aimed at controlling motor vehicles. In the United States, motor vehicle emission standards are set explicitly in clean air legislation, while policies at several levels of government are designed to reduce the use of cars for particular purposes like commuting. In Europe, high fuel taxes and subsidies to urban mass transit and intercity rail travel in large part aim to reduce car use.

working paper

Congestion Pricing and the Future of Transit

Abstract

Congestion pricing provides opportunities for transit to become more self-reliant. Both the theory of congestion pricing and its use in congested US corridors are examined. A 5% increase in commuter demand for transit is estimated in suburban corridors. New opportunities for transit are required if transit is to remain competitive in the USA. Automobile commuting is faster and more convenient as well as generously cross-subsidized for most US urban commuters.