Alyssa Ryan

Interests

Teaching

Transportation safety; Transportation statistics; Traffic flow theory; Human factors

Research

Travel behavior; Human factors; Driving simulation; Transportation safety; Transportation equity; Driver behavior; Traffic operations; Pedestrians and cyclists; Intelligent transportation systems

Courses

Scholarly Contributions

Journals/Publications

• Pan, M., & Ryan, A. (2023). Segmenting the target audience for transportation demand management programs: An investigation between mode shift and individual characteristics. International Journal of Sustainable Transportation, 18(1). doi:10.1080/15568318.2023.2201941
• Pan, M., & Ryan, A. M. (2023). Equity in Sustainable Transportation: An Investigation of Barriers and Individual and Contextual Factors. Transportation Research Record. doi:10.1177/03611981221143106
• Pan, M., & Ryan, A. M. (2023). How to select distracted driving countermeasures evaluation metrics: A systematic review. Journal of Transportation Safety & Security. doi:10.1080/19439962.2023.2233104
• Pan, M., Isham, E. A., & Ryan, A. M. (2023). Developing a small participant framework: An investigation of mode choice influential factors. Transportation Research Interdisciplinary Perspectives, 22, 100978. doi:10.1016/j.trip.2023.100978
• Ryan, A. M., Ai, C., Fitzpatrick, C., & Knodler, M. (2023). Developing a Geospatial Safety Analysis Tool: A Systematic Approach to Identify Safety-Critical Horizontal Curve Segments and Hazardous Contributing Factors. Journal of Transportation Engineering, Part A: Systems, 149(7), 04023051. doi:10.1061/JTEPBS.TEENG-7258
• Pan, M., & Ryan, A. M. (2022). Investigating Confirmation Bias in Transportation: An Analysis of Perceived Health Risk on Public Transit During the Pandemic. Journal of Transport and Health, 26(101485). doi:10.1016/j.jth.2022.101485
• Ryan, A. M., & Knodler, M. (2022). Influential crash conditions leading to injury differences experienced by female and male drivers. Journal of Transport and Health, 24.
• Ryan, A. M., Ai, C., Fitzpatrick, C., & Knodler, M. (2022). Crash proximity and equivalent property damage calculation techniques: An investigation using a novel horizontal curve dataset. Accident Analysis & Prevention, 166, 106550. doi:10.1016/j.aap.2021.106550
• Ryan, A. M., Hennessy, E., Ai, C., Kwon, W., Fitzpatrick, C., & Knodler, M. (2022). Driver performance at horizontal curves: Bridging critical research gaps to increase safety. New Traffic Safety Concepts Special Issue of Traffic Safety Research, 3(000014). doi:10.55329/lmji8901
• Ryan, A. (2021). What Type of Crash Can We Expect? Designing for Safety at Common Traffic Control Devices. Institute of Transportation Engineers. ITE Journal, 91(6), 34--38.
• Ryan, A. M., Ai, C., Knodler, M., & Fitzpatrick, C. (2021). Evaluation of small unmanned aerial system highway volume and speed‐sensing applications. IET Intelligent Transport Systems, 15, 84-97. doi:10.1049/itr2.12006
• Ryan, A. M., Barchers, C., Christofaa, E., & Knodlera, M. (2021). Equitable resource allocation for municipal safety: A data envelopment analysis. Transportation Research Part D: Transport and Environment, 97.
• Ryan, A. M., Zafian, T., Agrawal, R., Samuelc, S., & Knodlerd, M. (2021). Using SHRP2 NDS data to examine infrastructure and other factors contributing to older driver crashes during left turns at signalized intersections. Accident Analysis & Prevention, 156.
• Ryan, A., Christofa, E., Barchers, C., & Knodler, M. (2021). The relationship between municipal highway expenditures and socio-demographic status: Are safety investments equitably distributed?. Transportation Research Interdisciplinary Perspectives, 9, 100321.
• Zafian, T., Ryan, A., Agrawal, R., Samuel, S., & Knodler, M. (2021). Using SHRP2 NDS data to examine infrastructure and other factors contributing to older driver crashes during left turns at signalized intersections. Accident Analysis & Prevention, 156, 106141. doi:10.1016/j.aap.2021.106141
  More info

  Drivers age 65 and over have higher rates of crashes and crash-related fatalities than other adult drivers and are especially over-represented in crashes during left turns at intersections. This research investigated the use of SHRP2 Naturalistic Driving Study (NDS) data to assess infrastructure and other factors contributing to left turn crashes at signalized intersections, and how to improve older driver safety during such turns. NDS data for trips involving signalized intersections and crash or near-crash events were obtained for two driver age groups: drivers age 65 and over (older drivers) and a sample of drivers age 30-49, along with NDS pre-screening and questionnaire data. Video scoring of all trips was performed to collect additional information on intersection and trip conditions. To identify the most influential factors of crash risk during left turns at signalized intersections, machine learning and regression models were used. The results found that in the obtained NDS dataset, there was a relatively small volume of crashes during left turns at signalized intersections. Further, model results found the statistically significant variables of crash risk for older drivers were associated more with health and cognitive factors rather than the infrastructure or design of the intersections. The results suggest that a study using only SHRP2 NDS data will not lead to definitive findings or recommendations for infrastructure changes to increase safety for older drivers at signalized intersections and during left turns. Moreover, the findings of this study indicates the need to consider other data sources and data collection methods to address this critical literature gap in older driver safety.
• Ryan, A. M., Fitzpatrick, C., Christofa, E., & Knodler, M. (2020). Driver performance due to small unmanned aerial system applications in the vicinity of roadways. Transportation Research Part F: Traffic Psychology and Behaviour, 68, 118-131. doi:10.1016/j.trf.2019.12.006
• Ryan, A. M., Tainter, F., Fitzpatrick,, C., Gazzillo, J., Riessman, R., & Knodler, M. (2020). The impact of sex on motor vehicle crash injury outcomes. Journal of Transportation Safety & Security. doi:10.1080/19439962.2020.1834478
• Ryan, A., Page, M., Christofa, E., Fitzpatric, C., & Knodler, M. (2020). Linking geospatial crash and citation data to inform equitable enforcement decisions. Journal of Transportation Safety & Security, 14(2), 256-279. doi:10.1080/19439962.2020.1774020
• Ryan, A. M., Casola, E., Fitzpatrick, C., & Knodler, M. (2019). Flashing yellow arrows for right turn applications: A driving simulator study and static evaluation analysis. Transportation Research Part F: Traffic Psychology and Behaviour, 66, 324 - 338. doi:10.1016/j.trf.2019.09.013
• Ryan, A., Bouchard, C., Fitzpatrick, C., Knodler, M., & Ahmadjian, C. (2019). Analytical Comparison of Core Competencies across Civil Engineering Positions within New England Department of Transportation Agencies. Transportation Research Record, 2673, 427-437. doi:10.1177/0361198118822296
• Ryan, A., Francis, T., Cole, F., & Michael, K. (2018). Evaluation of Downstream Merge Behaviors Resulting from Driver Lane Choice: A Driving Simulator Study. Transportation Research Record, 2672, 123-131. doi:10.1177/0361198118792128