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    Item type:Publication, Access status: with files ,
    Die Transition des Radverkehrs als Aushandlungsprozess im Rahmen der Verkehrswende : eine empirische Untersuchung im Kontext des Radschnellweg Ruhr (RS1) Projekts
    (2026)
    Meyer, Christoph
    Since the mass motorisation in the 1960s, the understanding of mobility is heavily focused on cars and lead to a related expansion and conversion of the transportation system and referring regulatory systems. Mobility alternatives, such as the bicycle, were increasingly neglected and lost their societal relevance meeting mobility needs, which increased only slowly again in the following decades. With reference to bicycle traffic, there has not been a comprehensive mobility transition in this context, but it is gaining importance by innovations, such as pedelecs and cycle highways, as well as an increasing pressure to act due to climate change and traffic problems. Against the background, the Ruhr Cycle Highway (RS1) project and its context were examined using the approaches of the multi-level perspective (Geels 2002) and transformative governance capacities (Hölscher et al. 2019a) to identify adjustments and changes of the cycling system, the related regulatory systems and the societal relevance of cycling. The focus of the study is with reference to administrative-geographical aspects on seven major cities in the Ruhr region and its specific transformative governance capacities and governance processes, which ultimately determine the development and outcome of the mobility transition respectively the cycling transition. For this purpose, 14 expert interviews were conducted with individuals who, due to their planning-related interface function, have a good overview of bicycle traffic and current developments in their respective areas of responsibility. In addition, inspections of two already completed cycle highway sections were carried out, as well as a non-probabilistic pedestrian survey with 381 participants, in order to include planning-related adjustments and their effects, as well as societal developments relating to bicycle traffic in the study. The results of the study point to a cycling transition in the sense of a mobility transition for the study area, which can be attributed to adjustments to the bicycle transportation system, related regulatory systems and increasing societal relevance. Innovations such as pedelecs and cycle highways, like the RS1, can be seen as key drivers of the development, which contribute in conjunction with increasing pressure to act, despite local variations, to a stronger societal and political support for bicycle traffic and the associated adjustments of framework conditions and scope for action.
    Publicationtype: Book
      95  61
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    Item type:Publication, Access status: with files ,
    Bewertung von neuer Technik in der Mobilität am Beispiel autonomer Minibusse im ÖPNV ländlicher Räume
    (2026)
    Grote, Matthias
    ;
    Gertz, Carsten
    There are many hopes associated with autonomous driving in road traffic. These include greater road safety, better participation of people without a driving licence, a different use of the time gained and a reduction in the costs of motorised transport. Flexible mobility for all is expected in rural areas. However, in many respects, there is currently insufficient information available on the specific consequences of autonomous driving. The aim of this paper is to counter this deficit by using a procedure that provides knowledge at an early stage in a holistic assessment of a new mobility technology. In addition to determining the current state of the technology and its potential, the risks and collateral effects of the socio-technical system are to be identified. In the specific application of the procedure, the focus is to be on driverless minibuses in local public transport in rural areas as a possible area of application for the technology. Although the research carried out on available solutions to the methodological challenge does not provide a directly applicable procedure from the fields of transport planning, technology assessment and technology evaluation, it does however provide helpful theoretical findings. These lead to a highly structured procedure that is suitable for the evaluation of a technology in mobility. The work phases are divided into a scoping process, a definition of the individual target system, a review of the application conditions, a synthesis of potential application scenarios and an analysis and comprehensive evaluation of the socio-technical system. The decisive valuation phase comprises the determination of individual target achievement, an understanding of the current impact structure and a multiperspective categorisation of the risks. When applying the previously developed procedure, various methods are used to access the “Test centre for automated buses in the district of Herzogtum Lauenburg”, which enables the practical testing of automated test vehicles and the participation of stakeholders, users and the public. As a result, the evaluation shows that the use of driverless vehicles in public transport cannot fundamentally solve the challenges of mobility in diverse rural areas. The anticipated great potential of driverless minibuses in terms of increased safety, cost reduction with dispersed demand and unrestricted social participation currently appears to be overestimated for the application under consideration. The application of the risk analysis reveals negative consequences of driverless driving: potential dangers with a high level of damage include, in particular, misuse or manipulation of the technology, negative environmental and health effects, lack of participation and high complexity with susceptibility to faults and corresponding consequences in the event of high technical dependency. Further specific risks are identified that influence social acceptance and people's current perceptions. The newly developed injustice factor can be used to differentiate between objectively unjust risks and subjectively critically perceived risks. However, it also becomes clear that a sudden, major irreversible extent of damage caused by driverless driving in road traffic has not yet been recognised. The overall conclusion is that driverless driving is not fundamentally the solution in terms of the defined objectives. The mobility system's overarching capabilities with optimised integration and interconnectivity of different means of transport must be considered, taking into account the individual needs in the respective area. Reliability, spatial and temporal flexibility with short access routes as well as manageability and comprehensibility play an important role here. Driverless driving, as a possible component of the overall mobility to be designed, requires further critical consideration and control so that it can have a holistically positive impact. The added value of this process results from the resolution of the complexity of a technology in the management and control dilemma under the production of structured orientation knowledge. A comprehensive socio-technical understanding of the system under consideration is achieved, which enables a realistic and holistic view of the capabilities and risks of the technology in a situational analysis. The chosen approach motivates the linking of different methods that place people and their individual needs at the centre of the sustainable development of technology.
    Publicationtype: Doctoral Thesis
      232  142
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    Item type:Publication, Access status: with files ,
    Tarif-Erreichbarkeit: ein Verfahren zur preisbasierten Messung der Erreichbarkeit im Öffentlichen Personennahverkehr unter besonderer Berücksichtigung einkommensarmer Fahrgäste
    (2026)
    Aberle, Christoph
    ;
    Gertz, Carsten
    Public transport fares are an important cost factor for low-income earners. Although people with low economic status have increased their travel more than other groups since the 2000s, they have had to spend proportionately more out of their household budgets as fares had risen well above inflation until the introduction of the 9 Euro Ticket and the Deutschlandticket. Everyday destinations became less and less accessible, which increased the vulnerability to transport poverty and indirectly threatened the inclusion of those affected. Many have coped with the financial hardship by not travelling at all or by carefully spreading their journeys between single and day tickets to reduce their mobility costs. This study addresses this practice by systematically measuring, for the first time, the accessibility that pay-as-you-go fares facilitate. The fare accessibility indicator was developed for this purpose. Using the Hamburg and Berlin-Brandenburg transport associations HVV and VBB as examples, the indicator quantifies how many destinations a passenger can reach for 2.30 EUR. The indicator is examined in relation to eight variables for urbanity and analysed separately for urban and rural areas using one linear and three spatial multivariate regression models. The dissertation also examines whether the model sensitivity to transport equity increases with the spatial resolution. For this purpose, all statistical analyses are described at three spatial levels (municipality / stop / 500 m grid). Overall, the VBB offers greater fare accessibility. With a budget of 2.30 EUR, passengers in Berlin/Brandenburg can reach a median of 91 stops, compared to only 74 stops in the HVV. The distribution of fare accessibility is also different. In the HVV it clearly follows centrality, whereas in the VBB, with several district-wide social and special fares, financial accessibility extends far into the area. This is also reflected in the different regression parameters for two variables. In the HVV, high fare accessibility is associated with low purchasing power and low car availability, while in the VBB the opposite is true. The other estimators are largely similar, with positive correlations with rent and the public transport index, and negative correlations with travel time, dwelling area and distance to the city centre. Population density plays a smaller role in the multivariate model than expected. Overall, the models confirm that the level of spatial analysis has an influence on sensitivity. The stop level offers a compromise between the need for precision and the available computational capacity. With the newly developed fare accessibility, the study extends the established indicators by the aspect of financial costs. From a large-scale perspective, the indicator is quite similar to existing measures of urbanity. However, especially in the local transport and social planning, it can help to identify deficits in order to ameliorate transport poverty. A synopsis in English can be found in this JTranGeo Paper: DOI 10.1016/j.jtrangeo.2025.104348
    Publicationtype: Doctoral Thesis
      171  319
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    Effekte etablierter Carsharing-Angebote auf die Carsharing-Akzeptanz, den Pkw-Besitz und das Mobilitätsverhalten in urbanen Wohnquartieren
    (2025)
    Czarnetzki, Felix
    ;
    Gertz, Carsten
    In recent years, business-to-consumer carsharing has evolved from a niche market to a relevant mobility option in the inner-city areas of major German cities. However, most previous research on the use and impact of carsharing has only addressed the initial stages of its diffusion, focusing mainly on early adopters of carsharing. It remains uncertain to what extent findings from these studies can be applied to more mature carsharing services and their users. This dissertation, therefore, examines the acceptance and effects of carsharing in the inner city of Hamburg—a study area with comparatively well-established carsharing services and advanced diffusion of carsharing memberships among the population. Acceptance is defined as the current use of carsharing or the willingness to use it in the future. Regarding the effects of carsharing, the dissertation focuses on its impact on car ownership and mobility behavior. A survey of carsharing users and non-users in 16 inner-city neighborhoods in Hamburg, conducted in November and December 2019, serves as the empirical basis. The results show that the attitudes and socio-demographic characteristics of current carsharing users in Hamburg remain different from those of non-users, despite the advanced diffusion of carsharing memberships. Carsharing users in Hamburg are significantly more likely to be young, male, highly educated, have a high income, and have a relatively positive attitude toward car use, although the differences between carsharing users and non-users are rather modest. However, non-users who are strongly interested in carsharing—and thus represent potential future carsharing users—differ from the typical profile of current users. Compared to existing users, these interested non-users are more heterogeneous in terms of socio-demographics and attach less importance to car use while valuing cycling and public transport more. This suggests that the further establishment of carsharing services is indeed leading to a diversification of the user base. Regarding the effects of carsharing in Hamburg, the results show that carsharing reduces car ownership and the general level of car use, benefiting not only the carsharing services themselves but also (other) environmentally friendly means of transport. However, these effects are relatively small, mainly due to the different use and impact of station-based versus free-floating carsharing. Unlike station-based carsharing, free-floating carsharing does not appear to significantly reduce car ownership, yet it has seen the strongest growth in membership in recent years and is preferred by the vast majority of carsharing members in Hamburg. The results of this dissertation suggest that (more comprehensive) transport planning and policy support for carsharing services is advisable. This includes measures to increase the adoption of carsharing among currently underrepresented demographic groups, as well as measures to amplify the effect of carsharing on car ownership of its users.
    Publicationtype: Doctoral Thesis
      167  198
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    Item type:Publication, Access status: with files ,
    Wirkungen des fahrerlosen Fahrens im Logistiksystem
    (2023)
    Tjaden, Sandra
    ;
    Flämig, Heike
    The driverless driving will change the logistics system in the future. These changes are little discussed in the existing literature so far. This work helps to understand the effects of driverless driving in the logistics system. The findings are based on a literature review and a three-stage model approach, which qualifies the effects as well as quantifies them and allows the derivation of design options, which can be used by the relevant actors to reduce undesirable effects.
    Publicationtype: Doctoral Thesis
      422  1911
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    Szenarien zu energieautonomer Mobilität am Beispiel der Bodenseeregion
    (2021)
    Neumann, Hans-Martin
    ;
    Gertz, Carsten
    Using the example of the Lake Constance region, the thesis discusses whether and under what conditions the transport energy demand of a region can be completely covered by domestic, renewable sources. Several scenarios are being developed for this. It can be shown that a complete decarbonization of the transport system is possible if the necessary framework conditions are created in the next 5 to 10 years at the latest. Covering the transport energy demand with renewable energy sources from the region also appears possible under very favorable framework conditions.
    Publicationtype: Doctoral Thesis
      618  1654
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    Item type:Publication, Access status: with files ,
    Mobilitätsmuster im Personenwirtschaftsverkehr
    (2021)
    Rosenberger, Kerstin Mareike
    ;
    Flämig, Heike
    Based on an extensive structured literature analysis, a descriptive model of the system of passenger commercial transport is provided. It systematizes determining factors on three decision-making levels about the organization, the vehicle as well as the vehicle deployment. These corporate decisions affect different mobility patterns, which have been identified by cluster analyses, based on driving profiles and their evaluation variables, using extensive empirical data of firms from Hamburg.
    Publicationtype: Doctoral Thesis
      515  1114
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    Item type:Publication, Access status: with files ,
    Die Berechnung kleinräumiger und multimodaler Erreichbarkeiten auf regionaler Ebene
    (2021)
    Peter, Marcus
    ;
    Gertz, Carsten
    This research focusses on the influence of spatial disaggregation on the rigor of accessibility analysis. A multimodal accessibility model of the Hamburg Metropolitan Region was configured in different ways to value the benefits according to different location-based accessibility measures and spatial resolutions. Additional analyses were made to investigate the application of detailed accessibility models in local public transport plans.
    Publicationtype: Doctoral Thesis
      498  1651
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    Item type:Publication, Access status: with files ,
    Urban Rural SOLUTIONS : Innovationen im regionalen Daseinsvorsorgemanagement durch Unterstützung von interkommunalen Kooperationen Endbericht
    (readbox unipress, 2020)
    Matthes, Gesa
    ;
    Preising, Tobias
    ;
    Reuschel, Saskia
    ;
    Schreiber, Sarah
    ;
    Moschner, Sandra-Luisa
    Die zu erwartenden demografischen und raumstrukturellen Veränderungen der kommenden Jahre sowie die Anforderung, Angebote der Daseinsvorsorge für die Bevölkerung einer Region zugänglich, bezahlbar und gleichzeitig für die Kommunen finanzierbar zu halten, werfen Fragen zur langfristigen Sicherung der Daseinsvorsorge auf. Ein regionales Daseinsvorsorgemanagement kann zur Sicherung der Daseinsvorsorge beitragen, ist jedoch nicht einfach umzusetzen: den verantwortlichen Behörden fehlt es häufig an Zeit, Personen, Ressourcen und geeigneten Strukturen; erforderliche Methoden oder Informationen müssen aufwendig erschlossen werden. Die vom Bundesministerium für Bildung und Forschung (BMBF) geförderte Innovationsgruppe UrbanRural SOLUTIONS hat Werkzeuge entwickelt, die ein regionales Daseinsvorsorgemanagement sowie die transdisziplinäre und interkommunale Zusammenarbeit künftig erleichtern sollen. Diese werden im vorliegenden Band vorgestellt: Der als »Daseinsvorsorgeatlas Niedersachsen« bereits als Pilotprojekt implementierte digitale Daseinsvorsorgeatlas zielt auf einen leichten Zugang zu digital aufbereiteten räumlichen Informationen. Der »Dialogprozess Regionale Daseinsvorsorge« erleichtert die Gestaltung kooperativer, grenz- und disziplinübergreifender Innovationsprozesse.
    Publicationtype: Book
      1021  4011
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    Item type:Publication, Access status: without files ,
      119