published journal article

Telecommuting and Travel during COVID-19: An Exploratory Analysis across Different Population Geographies in the U.S.A.

Transportation Research Record: Journal of the Transportation Research Board

Abstract

This study explores the impact of the COVID-19 pandemic on telecommuting (working from home) and travel during the first year of the pandemic in the U.S.A. (from March 2020 to March 2021), with a particular focus on examining the variation in impact across different U.S. geographies. We divided 50 U.S. states into several clusters based on their geographic and telecommuting characteristics. Using K-means clustering, we identified four clusters comprising 6 small urban states, 8 large urban states, 18 urban–rural mixed states, and 17 rural states. Combining data from multiple sources, we observed that nearly one-third of the U.S. workforce worked from home during the pandemic, which was six times higher than the pre-pandemic period, and that these fractions varied across the clusters. More people worked from home in urban states compared with rural states. As well as telecommuting, we examined several activity travel trends across these clusters: reduction in the number of activity visits; changes in the number of trips and vehicle-miles traveled; and mode usage. Our analysis showed there was a greater reduction in the number of workplace and nonworkplace visits in urban states compared with rural states. The number of trips in all distance categories decreased except for long-distance trips, which increased during the summer and fall of 2020. The changes in overall mode usage frequency were similar across urban and rural states with a large drop in ride-hailing and transit use. This comprehensive study can provide a better understanding of the regional variation in the impact of the pandemic on telecommuting and travel, which can facilitate informed decision-making.

Suggested Citation
Rezwana Rafiq, Michael G. McNally and Md Yusuf Sarwar Uddin (2023) “Telecommuting and Travel during COVID-19: An Exploratory Analysis across Different Population Geographies in the U.S.A.”, Transportation Research Record: Journal of the Transportation Research Board, 2677(4), pp. 562–582. Available at: 10.1177/03611981221109182.

working paper

New Directions for Understanding Transportation and Land Use

Publication Date

October 30, 1989

Associated Project

Working Paper

UCTC No. 2

Areas of Expertise

Abstract

Theories of relationships between land use and transportation, and the empirical research conducted to test these relationships are reviewed. Recent empirical research seldom supports theoretical expectations. These results are explained by the changes in urban structure that have occurred over the past three decades. The paper concludes with some suggestions for revising the theories to represent conditions in contemporary urban areas better.

Suggested Citation
Genevieve Giuliano (1989) New Directions for Understanding Transportation and Land Use. Working Paper UCTC No. 2. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/72f0362d.

published journal article

Intercity impacts of work-from-home with both remote and non-remote workers

Journal of Housing Economics

Publication Date

March 1, 2023

Author(s)

Jan Brueckner, S. Sayantani

Abstract

This paper generalizes the simple two-city work-from-home model of Brueckner et al. (2022) by adding a group of non-remote workers, who must live in the city where they work. The results show that the main qualitative conclusions of BKL regarding the intercity effects of WFH are unaffected by this modification, with WFH yielding the same aggregate population and employment changes in the two cities and the same house-price and wage effects as in the simpler model. Even though the aggregate population effects are the same, the population relocation of non-remote workers is in the opposite direction to that of remote workers, which matches the direction in BKL. These conclusions are useful because they establish the robustness of BKL’s highly parsimonious model. The paper also contains material surveying other theoretical research on WFH as well as empirical work in the area, including BKL’s empirical findings in support of their model.

Suggested Citation
Jan K. Brueckner and S. Sayantani (2023) “Intercity impacts of work-from-home with both remote and non-remote workers”, Journal of Housing Economics, 59, p. 101910. Available at: 10.1016/j.jhe.2022.101910.

working paper

Studying Road Pricing Policy with Panel Data Analysis: The San Diego I-15 HOT Lanes

Publication Date

September 1, 2002

Author(s)

Jacqueline Golob, Thomas Golob

Abstract

A three-year experiment is underway in San Diego County, California that allows solo drivers to pay a fee to use “Express Lanes” i.e. carpool lanes to avoid an eighty-mile highly congested stretch of freeway. These lanes are also commonly referred to as High Occupancy Toll (HOT) Lanes. The facility has two reversible lanes in the freeway median separated by concrete barriers from the I-15 main lanes with access available only at the two end points. Tolls charged commonly range from $.50 to $4.00 per trip but in exceptionally congested conditions can go as high as $8. Fees charged can change dynamically every six minutes to reflect changing traffic in the carpool lanes. Changeable message signs post the price. The algorithm controlling the prices is adjusted to maintain free flow conditions in the carpool lanes at all times. Carpools of two or more persons retain free travel. Subscribers who chose to use the lanes are charged the posted toll using transponder technology and monthly credit-card billing. The opening hours for the Express Lanes are 5:45 to 9:15 a.m. inbound to San Diego and 3:00 – 7:00 p.m. outbound from San Diego.

Suggested Citation
Jacqueline M Golob and Thomas F. Golob (2002) Studying Road Pricing Policy with Panel Data Analysis: The San Diego I-15 HOT Lanes. Working Paper UCI-ITS-WP-02-5, UCTC 574. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/70k1j8v0.

published journal article

On-Line Algorithms for the Dynamic Traveling Repair Problem

Journal of Scheduling

Abstract

We consider the dynamic traveling repair problem in which requests with deadlines arrive through time on points in a metric space. Servers move from point to point at constant speed. The goal is to plan the motion of servers so that the maximum number of requests are met by their deadline. We consider a restricted version of the problem in which there is a single server and the length of time between the arrival of a request and its deadline is constant. We give upper bounds for the competitive ratio of two very natural algorithms as well as several lower bounds for any deterministic algorithm. Most of the results in this paper are expressed as a function of β, the diameter of the metric space. In particular, we prove that the upper bound given for one of the two algorithms is within a constant factor of the best possible competitive ratio.

Suggested Citation
Sandy Irani, Xiangwen Lu and Amelia Regan (2004) “On-Line Algorithms for the Dynamic Traveling Repair Problem”, Journal of Scheduling, 7(3), pp. 243–258. Available at: 10.1023/B:JOSH.0000019683.85186.57.

published journal article

Land use regulation and intraregional population–employment interaction

The Annals of regional science

Publication Date

February 1, 2013

Author(s)

Jae Hong Kim, Geoffrey J.D. Hewings
Suggested Citation
Jae Hong Kim and Geoffrey J.D. Hewings (2013) “Land use regulation and intraregional population–employment interaction”, The Annals of regional science, 51(3), pp. 671–693. Available at: 10.1007/s00168-013-0557-1.

published journal article

Parking and urban form

Journal of economic geography

Publication Date

February 1, 2016

Author(s)

Jan Brueckner, Sofia F. Franco
Suggested Citation
Jan K. Brueckner and Sofia F. Franco (2016) “Parking and urban form”, Journal of economic geography, 17(1), pp. 95–127. Available at: 10.1093/jeg/lbv048.

published journal article

Association between wild vascular plant species richness and preterm birth in urban areas: a retrospective cohort study in Southern California

ISEE Conference Abstracts

Publication Date

August 15, 2024

Author(s)

Mengyi Li, Qiping Fan, Yi Sun, Anqi Jiao, John Molitor, Tarik Benmarhnia, Jiu Chiuan Chen, Darios Getahun, Jun Wu

Abstract

BACKGROUND AND AIM[|]Urban biodiversity has a profound impact on human health that has not been thoroughly investigated. Little research exists regarding the associations between plant species richness and preterm birth (PTB). We aimed to examine the relationships between PTB and plant species richness, and the effect modifications by maternal characteristics, air pollution, ambient temperature, and the coronavirus disease (COVID-19) pandemic.[¤]METHOD[|]Clinical and sociodemographic data were obtained from Kaiser Permanente Southern California electronic health records in 2015–2021. PTB was defined as gestational age at birth less than 37 weeks. Maternal residential plant species diversity data were extracted from a wild vascular plant species diversity map across California urban areas at 5km resolution, and the maternal residential green space exposure data were assessed from satellite-based images (Normalized Difference Vegetation Index (NDVI) and land-cover green space). Multilevel logistic regressions were applied to examine the association between PTB and plant species diversity, after controlling for maternal age, race/ethnicity, education, and median household income. We also examined the effect modifications by maternal characteristics, air pollution, ambient temperature, and COVID pandemic (delivery before or during the pandemic) factors.[¤]RESULTS[|]In total, we included 302,266 births occurring between January 1, 2015, and December 31, 2021, with 21,421 (7.1%) PTB cases. Plant species richness in 2500m buffer showed a protective association with PTB (odds ratio [OR]: 0.980, 95% CI: 0.964, 0.996). The association persisted after further adjustments for NDVI and land-cover green space. The risk of PTB associated with plant species richness were significantly lower among mothers having a college degree, living in neighborhood with higher levels of O3 and average ambient temperature, and during the pandemic.[¤]CONCLUSIONS[|]This study found that maternal exposure to higher plant species diversity was associated with a decreased risk of PTB. Our findings suggest a complex interplay of sociodemographic and environmental factors influencing PTB risks.[¤]

Suggested Citation
Mengyi Li, Qiping Fan, Yi Sun, Anqi Jiao, John Molitor, Tarik Benmarhnia, Jiu Chiuan Chen, Darios Getahun and Jun Wu (2024) “Association between wild vascular plant species richness and preterm birth in urban areas: a retrospective cohort study in Southern California”, ISEE Conference Abstracts, 2024(1). Available at: 10.1289/isee.2024.0426.

book/book chapter

Using evolutionary programming to control metering rates on freeway ramps

Publication Date

January 1, 1995

Author(s)

John R. McDonnell, David B. Fogel, Craig Rindt, Will Recker, Lawrence J. Fogel
Suggested Citation
John R. McDonnell, David B. Fogel, Craig R. Rindt, Wilfred W. Recker and Lawrence J. Fogel (1995) “Using evolutionary programming to control metering rates on freeway ramps”, in Evolutionary algorithms in management applications. Springer Berlin Heidelberg, pp. 305–327. Available at: https://doi.org/10.1007/978-3-642-61217-6_18.

MS Thesis

Implementation of a Real-time Information Processing Algorithm in TRANSYT-7F

Suggested Citation
Balaji Ramanathan (1992) Implementation of a Real-time Information Processing Algorithm in TRANSYT-7F. MS Thesis. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/17uq3m8/alma991031508139704701.