PhD student in Economics

Thesis in progress

Title: Evaluation of on-street parking policies and urban access regulation

Supervisors: Louafi Bouzouina et Ouassim Manout

Keywords: Econometrics; Policy evaluation; Parking; Pricing; Parking demand; Externalities; Acceptability; Low Emission Zones; Traffic Restriction Zones; Built environment; Machine Learning

Research:

Parking is a key policy tool for regulating car use in cities. Because all car trips start and end with parking, parking policies directly affect urban accessibility, congestion, public space use, and emissions related to traffic and cruising. In large metropolitan areas, they represent a central instrument to mitigate negative externalities such as CO₂, NOx and particulate emissions, congestion, and excessive occupation of public space.

This PhD focuses on the evaluation of parking policies, with a particular emphasis on pricing schemes, differentiated tariffs, and the regulation of on-street parking demand. It investigates how these policies affect user behavior depending on vehicle characteristics, user profiles, spatial contexts, and time patterns. It also aims to better understand the role of parking in shaping mobility patterns and car use in urban areas.

Initial analyses conducted on the Lyon metropolitan area highlight the role of the built environment in shaping on-street parking demand. These results provide a first step toward more robust ex ante and ex post evaluations of parking policies, with a view to informing public decision-making.

More broadly, the research takes place in a context of progressive implementation of urban mobility policies. In Lyon, parking policies, Low Emission Zones (LEZ), and Low Traffic Zones (LTZ) are gradually introduced until 2025. The thesis primarily focuses on parking policies while accounting for their interaction with other instruments regulating car access to cities.

Finally, particular attention is paid to the social and political acceptability of these policies. Beyond effectiveness, parking policies raise important issues related to equity, accessibility, and the distribution of costs across users. The objective is to produce results that are both academically rigorous and relevant for policymakers.

In addition to academic publications, the research aims to disseminate findings to public authorities and a broader audience

Degrees:

Master in Transport, Networks, Territories – ENTPE / Lyon 2 University (2023-2024)

Engineering degree from the École Nationale des Travaux Publics de l’État (ENTPE), with a specialization in Transport and Mobility (2021–2024).

Publications and presentations:

1. IN THE CONTEXT OF THE DOCTORAL RESEARCH

1.1. Peer-reviewed journal articles

  • Combes, E., Bouzouina, L. , Manout, O. , The impact of the built environment on on-street car parking duration, Transportation Research Interdisciplinary Perspectives, Volume 36,
    2026, 101878, ISSN 2590-1982, https://doi.org/10.1016/j.trip.2026.101878.

1.2. Presentations at a scientific conference

  • Combes, E. (2026). Evaluation of a differentiated parking pricing policy based on vehicles’ environmental performances, Séminaire FORBAC, PEPR MOBIDEC (Programme et Équipements Prioritaires de Recherche “Digitalisation et Décarbonation des Mobilités”), avril 2026.
  • Combes, E., Bouzouina, L., & Manout, O. (2026). How Do Prices Affect On-street Parking Duration? Evidence from a User Panel . 3ème conférence annuelle de l’Association Française d’Économie des Transports (AFET) 2025 , Lyon (France).
  • Combes, E., Manout, O., & Bouzouina, L. (2025). Une tarification de stationnement différenciée selon les performances environnementales du véhicule : Quels impacts sur la demande ? 7èmes Rencontres Francophones Transport Mobilité 2025 (RFTM), Dunkerque (France).
  • Combes, E., Manout, O., & Bouzouina, L. (2025). L’impact de l’environnement bâti sur la durée de stationnement en voirie. Journées Mobilités du Réseau scientifique et technique des ministères de l’écologie et des territoires 2025 (JMRST), Vaulx-en-Velin (France).
  • Combes, E., Bouzouina, L., & Manout, O. (2025). The impact of the built environment on car parking duration. 13th Symposium of the European Association for Research in Transportation 2025 (hEART), Munich (Allemagne).

1.3. Some examples of non-scientific communications and knowledge dissemination as an expert

  • Combes, E. (2026). The City of Lyon’s new parking policy: first findings. Webinaire pour le projet Reallocate financée par le programme européen Horizon Europe, mars 2026.
  • Combes, E. (2026). La nouvelle politique de stationnement de la Ville de Lyon : premiers enseignements. Groupe de travail stationnement de L’Association des Ingénieur.e.s territoriaux et Ingénieur.e.s en chef territoriaux de France (AITF) 2026, Besançon (France).
  • Combes, E. (2025). Une tarification de stationnement différenciée selon les performances environnementales du véhicule : Quels impacts sur la demande ? Une analyse exploratoire. Présentation à la DMU de la ville de Lyon.
  • Combes, E. (2024). L’impact de l’environnent bâti sur les durées de stationnement. Une approche par Machine Learning . Présentation à la DMU de la ville de Lyon.

2. MASTER’S THESES

  • Combes, E. (2024). Déterminants de la demande de stationnement sur rue : Une approche par Machine Learning sur la ville de Lyon [Mémoire de master, ENTPE/Lyon 2].

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