Imperial College London

DrAhmadrezaFaghih Imani

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Research Associate
 
 
 
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Contact

 

s.faghih-imani

 
 
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Location

 

Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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28 results found

Faghih Imani A, Harding C, Srikukenthiran S, Miller EJ, Nurul Habib Ket al., 2020, Lessons from a Large-Scale Experiment on the Use of Smartphone Apps to Collect Travel Diary Data: The "City Logger" for the Greater Golden Horseshoe Area, TRANSPORTATION RESEARCH RECORD, Vol: 2674, Pages: 299-311, ISSN: 0361-1981

Journal article

Faghih-Imani A, Eluru N, 2020, A finite mixture modeling approach to examine New York City bicycle sharing system (CitiBike) users’ destination preferences, Transportation, Vol: 47, Pages: 529-553, ISSN: 1572-9435

Given the recent growth of bicycle-sharing systems (BSS) around the world, it is of interest to BSS operators/analysts to identify contributing factors that influence individuals’ decision processes in adoption and usage of bicycle-sharing systems. The current study contributes to research on BSS by examining user behavior at a trip level. Specifically, we study the decision process involved in identifying destination locations after picking up the bicycle at a BSS station. In the traditional destination/location choice approaches, the model frameworks implicitly assume that the influence of exogenous factors on the destination preferences is constant across the entire population. We propose a finite mixture multinomial logit (FMMNL) model that accommodates such heterogeneity by probabilistically assigning trips to different segments and estimate segment-specific destination choice models for each segment. Unlike the traditional destination choice based multinomial logit (MNL) model or mixed multinomial logit (MMNL), in an FMMNL model, we can consider the effect of fixed attributes across destinations such as users’ or origins’ attributes in the decision process. Using data from New York City bicycle-sharing system (CitiBike) for 2014, we develop separate models for members and non-members. We validate our models using hold-out samples and compare our proposed FMMNL model results with the traditional MNL and MMNL model results. The proposed FMMNL model provides better results in terms of goodness of fit measures, explanatory power and prediction performance.

Journal article

Harding C, Faghih Imani A, Srikukenthiran S, Miller EJ, Nurul Habib Ket al., 2020, Are we there yet? Assessing smartphone apps as full-fledged tools for activity-travel surveys, Transportation, ISSN: 0049-4488

© 2020, Springer Science+Business Media, LLC, part of Springer Nature. Given the limitations of traditional methods of data collection and the increased use of smartphones, there is growing attention given to using smartphone apps for activity-travel surveys. Smartphones, through their location-logging capability, allow for the collection of high-quality data on the travel patterns of individuals over multiple days while minimizing the burden on those being monitored. This paper presents the results of an investigation into the potential and limitations of smartphone apps as passenger travel survey instruments. It evaluates the accuracy and performance of various smartphone apps using properly recorded ‘ground truth’ data. Through an open and global invitation to travel survey app and trace processing suite developers, a total of 17 apps were recruited for testing. A controlled experiment was devised, and the accuracy of the apps evaluated based on their ability to reproduce ground truth trip information. Further, the performance of the apps in terms of battery drain was also quantified and evaluated. Results indicate that while accuracy in terms of the trip ends/starts is reasonably high in most cases, mode inference accuracy varied significantly, with a maximum 65–75% accuracy achieved. As such, until significant improvements in mode inference algorithms arise, purely passive location-logging smartphone apps cannot serve as full-fledged automated travel survey instruments. While this may seem problematic, with minor input from respondents regarding regularly visited locations and modes used, as well as specific test case tuning and use of external data such as General Transit Feed Specification, there is an excellent potential to significantly reduce overall response burden and allow for high quality multi-day travel diary data to be collected. Implications of our findings for app design are discussed.

Journal article

Pawlak J, Imani AF, Sivakumar A, 2020, A microeconomic framework for integrated agent-based modelling of activity-travel patterns and energy consumption, Procedia Computer Science, Vol: 170, Pages: 785-790, ISSN: 1877-0509

The sophistication in the demand management approaches in both transport and energy sectors and their interaction call for modelling approaches that consider both sectors jointly. For agent-based microsimulation models of travel demand and energy consumption, this implies the necessity to ensure consistent representation of user behaviour with respect to mobility and energy consumption behaviours across the model components. Therefore this paper proposes a microeconomic framework, termed the HOT model (Home, Out-of-home, Travel) grounded in the goods-leisure paradigm, but extended to incorporate emerging activity-travel behaviour patterns and their energy consumption implications. We discuss how the model can be operationalised and embedded within agent-based frameworks with a case study using time use and energy consumption data from the UK.

Journal article

Anowar S, Faghih-Imani A, Miller EJ, Eluru Net al., 2019, Regret minimization based joint econometric model of mode choice and departure time: a case study of university students in Toronto, Canada, TRANSPORTMETRICA A-TRANSPORT SCIENCE, Vol: 15, Pages: 1214-1246, ISSN: 2324-9935

Journal article

Imani AF, Miller EJ, Saxe S, 2019, Cycle accessibility and level of traffic stress: A case study of Toronto, JOURNAL OF TRANSPORT GEOGRAPHY, Vol: 80, ISSN: 0966-6923

Journal article

Clarry A, Imani AF, Miller EJ, 2019, Where we ride faster? Examining cycling speed using smartphone GPS data, SUSTAINABLE CITIES AND SOCIETY, Vol: 49, ISSN: 2210-6707

Journal article

Hasnat MM, Faghih-Imani A, Eluru N, Hasan Set al., 2019, Destination choice modeling using location-based social media data, JOURNAL OF CHOICE MODELLING, Vol: 31, Pages: 22-34, ISSN: 1755-5345

Journal article

Reynaud F, Faghih-Imani A, Eluru N, 2018, Modelling bicycle availability in bicycle sharing systems: A case study from Montreal, SUSTAINABLE CITIES AND SOCIETY, Vol: 43, Pages: 32-40, ISSN: 2210-6707

Journal article

Tetreault L-F, Eluru N, Hatzopoulou M, Morency P, Plante C, Morency C, Reynaud F, Shekarrizfard M, Shamsunnahar Y, Imani AF, Drouin L, Pelletier A, Goudreau S, Tessier F, Gauvin L, Smargiassi Aet al., 2018, Estimating the health benefits of planned public transit investments in Montreal, ENVIRONMENTAL RESEARCH, Vol: 160, Pages: 412-419, ISSN: 0013-9351

Journal article

Paleti R, Imani AF, Eluru N, Hu H-H, Huang Get al., 2017, An integrated model of intensity of activity opportunities on supply side and tour destination & departure time choices on demand side, JOURNAL OF CHOICE MODELLING, Vol: 24, Pages: 63-74, ISSN: 1755-5345

Journal article

Faghih-Imani A, Anowar S, Miller EJ, Eluru Net al., 2017, Hail a cab or ride a bike? A travel time comparison of taxi and bicycle-sharing systems in New York City, TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE, Vol: 101, Pages: 11-21, ISSN: 0965-8564

Journal article

Faghih-Imani A, Eluru N, Paleti R, 2017, How bicycling sharing system usage is affected by land use and urban form: analysis from system and user perspectives, Conference of the International-Association-for-Travel-Behavior-Research (IATBR), Publisher: EDITORIAL BOARD EJTIR, Pages: 425-441, ISSN: 1567-7133

Conference paper

Shekarrizfard M, Faghih-Imani A, Tetreault L-F, Yasmin S, Reynaud F, Morency P, Plante C, Drouin L, Smargiassi A, Eluru N, Hatzopoulou Met al., 2017, Modelling the Spatio-Temporal Distribution of Ambient Nitrogen Dioxide and Investigating the Effects of Public Transit Policies on Population Exposure, ENVIRONMENTAL MODELLING & SOFTWARE, Vol: 91, Pages: 186-198, ISSN: 1364-8152

Journal article

Faghih-Imani A, Hampshire R, Marla L, Eluru Net al., 2017, An empirical analysis of bike sharing usage and rebalancing: Evidence from Barcelona and Seville, TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE, Vol: 97, Pages: 177-191, ISSN: 0965-8564

Journal article

Shekarrizfard M, Faghih-Imani A, Tetreault L-F, Yasmin S, Reynaud F, Morency P, Plante C, Drouin L, Smargiassi A, Eluru N, Hatzopoulou Met al., 2017, Regional assessment of exposure to traffic-related air pollution: Impacts of individual mobility and transit investment scenarios, SUSTAINABLE CITIES AND SOCIETY, Vol: 29, Pages: 68-76, ISSN: 2210-6707

Journal article

Faghih-Imani A, Eluru N, 2017, Examining the impact of sample size in the analysis of bicycle-sharing systems, TRANSPORTMETRICA A-TRANSPORT SCIENCE, Vol: 13, Pages: 139-161, ISSN: 2324-9935

Journal article

Faghih-Imani A, Eluru N, 2016, Determining the role of bicycle sharing system infrastructure installation decision on usage: Case study of montreal BIXI system, TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE, Vol: 94, Pages: 685-698, ISSN: 0965-8564

Journal article

Shekarrizfard M, Faghih-Imani A, Crouse DL, Goldberg M, Ross N, Eluru N, Hatzopoulou Met al., 2016, Individual exposure to traffic related air pollution across land-use clusters, TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT, Vol: 46, Pages: 339-350, ISSN: 1361-9209

Journal article

Faghih-Imani A, Eluru N, 2016, Incorporating the impact of spatio-temporal interactions on bicycle sharing system demand: A case study of New York CitiBike system, JOURNAL OF TRANSPORT GEOGRAPHY, Vol: 54, Pages: 218-227, ISSN: 0966-6923

Journal article

Pinjari AR, Augustin B, Sivaraman V, Imani AF, Eluru N, Pendyala RMet al., 2016, Stochastic frontier estimation of budgets for Kuhn-Tucker demand systems: Application to activity time-use analysis, TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE, Vol: 88, Pages: 117-133, ISSN: 0965-8564

Journal article

Shekarrizfard M, Faghih-Imani A, Hatzopoulou M, 2016, An examination of population exposure to traffic related air pollution: Comparing spatially and temporally resolved estimates against long-term average exposures at the home location, ENVIRONMENTAL RESEARCH, Vol: 147, Pages: 435-444, ISSN: 0013-9351

Journal article

Faghih-Imani A, Eluru N, 2015, Analysing bicycle-sharing system user destination choice preferences: Chicago's Divvy system, JOURNAL OF TRANSPORT GEOGRAPHY, Vol: 44, Pages: 53-64, ISSN: 0966-6923

Journal article

Angueira JR, Faghih-Imani A, Enam A, Konduri KC, Eluru Net al., 2015, Exploration of Short-Term Vehicle Utilization Choices in Households with Multiple Vehicle Types, TRANSPORTATION RESEARCH RECORD, Pages: 39-47, ISSN: 0361-1981

Journal article

Faghih-Imani A, Eluru N, El-Geneidy AM, Rabbat M, Haq Uet al., 2014, How land-use and urban form impact bicycle flows: evidence from the bicycle-sharing system (BIXI) in Montreal, JOURNAL OF TRANSPORT GEOGRAPHY, Vol: 41, Pages: 306-314, ISSN: 0966-6923

Journal article

Imani AF, Ghafghazi G, Eluru N, Pinjari ARet al., 2014, A multiple-discrete approach for examining vehicle type use for daily activity participation decisions, TRANSPORTATION LETTERS-THE INTERNATIONAL JOURNAL OF TRANSPORTATION RESEARCH, Vol: 6, Pages: 1-13, ISSN: 1942-7867

Journal article

Sobhani A, Eluru N, Faghih-Imani A, 2013, A latent segmentation based multiple discrete continuous extreme value model, TRANSPORTATION RESEARCH PART B-METHODOLOGICAL, Vol: 58, Pages: 154-169, ISSN: 0191-2615

Journal article

Faghih-Imani A, Amador-Jimenez L, 2013, Toward Sustainable Pavement Management Incorporating Environmental Impacts of Pavement Treatments into a Performance-Based Optimization, TRANSPORTATION RESEARCH RECORD, Pages: 13-21, ISSN: 0361-1981

Journal article

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