380 Handel, Kommunikation, Verkehr
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The prize-collecting vehicle routing problem with single and multiple depots and non-linear cost
(2013)
In this paper, we propose a new routing problem to model a highly relevant planning task in small package shipping. We consider the Prize-Collecting Vehicle Routing Problem with Non-Linear cost in its single and multi-depot version, which integrates the option of outsourcing customers to subcontractors instead of serving them with the private fleet. Thereby, a lower bound on the total customer demand to be served by the private fleet guarantees a high utilization of the fleet capacity. To represent the practical situation, where a discount is given by a subcontractor if larger amounts of packages are outsourced, subcontracting costs follow a non-linear function. The considered problem is NP-hard and we propose an Adaptive Variable Neighborhood Search algorithm to solve instances of realistic size. We propose new benchmark sets for the single and the multi-depot problem, which are adapted from test instances of the capacitated VRP and the closely related Multi-Depot VRP with Private fleet and Common carrier. In numerical studies, we investigate the performance of our algorithm on the newly generated test instances and on standard benchmark problems of related problems. Moreover, we study the effect of different cost functions and different values of the minimal demand to be served by the private fleet on the routing solutions obtained.
Amidst the growing interest in enhancing the academic understanding of the relationships between e-shopping and transport, a key element remains underexplored – the impact of e-shopping on spatial accessibility to in-store retail. The paper studies variations in multimodal accessibility to in-store retail between e-shopper groups and the associated spatial effects. The research is based on a face-to-face questionnaire, administered in the city of Alcalá de Henares (Madrid Metropolitan Area, Spain), which provides data on socio-economic characteristics, e-shopping habits, and travel time preferences to reach in-store retail. Clustering techniques serve to identify three e-shopper groups: occasional e-shoppers with a car, infrequent e-shoppers with a car, and frequent e-shoppers without a car. A comparison of e-shopper distance-decay functions to reach in-store retail is made, revealing significant differences between the three e-shopper groups for car and public transport for any time interval. However, for walking such differences are limited to time intervals between 10 and 40 minutes. Distance-decay functions are processed through a gravity-based model, identifying three main multimodal accessibility places: highly resistant places to e-shopping, moderately resistant places, and vulnerable places. Places that are highly resistant to e-shopping are mainly located in the city centre, while vulnerable places are mostly found in the city’s periphery. The paper closes with concluding remarks on policymaking and a few pathways for future research.
Evaluating spatial inequalities using a single walking accessibility measure is quite challenging. In response, the paper proposes combining two accessibility measures (real and potential) to provide additional insights into the identification and mapping of spatial inequalities. The municipality of Getafe in the Madrid Metropolitan Area, Spain serves as a case study. A questionnaire, administered via face-to-face interviews, recorded the resident’s walking preferences for reaching in-store retail. A gravity-based model was used to calculate real and potential accessibilities, which were combined to map four accessibility places that originate spatial inequalities: advantageous, moderately advantageous, moderately disadvantageous, and disadvantageous. The results suggest that potential accessibility values are higher than real accessibility values, and the final map shows the city centre residents (mostly seniors) benefit from the advantageous accessibility places. Disadvantageous places are mainly found in the city’s periphery, where younger people live.
During the last 15 years most central and east european countries faced an era of institutional, economic and demographic transition. With the fall of the wall and the end of the Soviet Union, the former socialist countries transformed their political, economic and social institutions; today, some of them are already a member state of the European Union. The re- unificated Germany was not only affected by this process in its eastern part, the former German Democratic Republic (GDR), where the political and institutional structures were entirely exchanged; with the end of the “Rheinische Bundesrepublik”, the incarnation of a welfare and growth oriented Fordist society, also former West Germany had to adapt to this transition and still is facing a process of institutional modernisation.
Facing the challenges of motorised traffic, many cities around the globe started implementing measures to transform their urban transport systems. One of the major challenges for the success of adequate policies is not only their effectiveness but also whether they are accepted by city residents. With a quantitative case study in four neighbourhoods in Frankfurt am Main (N = 821), this article investigates the acceptability of three measures: (i) parking management, (ii) the conversion of car lanes into cycle lanes and (iii) the closure of an inner city arterial road to car traffic. The results show a surprisingly high acceptability for all measures if the benefits for local residents are tangible. Thus, successful policy packages may combine push measures with either pull measures, as suggested frequently in the literature, or with improvements for other land uses (e.g. re-using former car-parking spaces for non-transport purposes, such as greenery or seating areas). Furthermore, the perceived effectiveness, daily travel practices and intentions to reduce car use, the built environment and, to a lesser degree, socio-demographics explain differences in acceptability by population group.
Highlights
- Cost-free ticket increases public transport use even when the share was high beforehand
- Free tickets are more effective than just a price reduction (zero-price effect)
- Low income, female and older employees benefit the most
- Not only travel behaviour but also attitudes change
- Cost-free public transport is one component in a set of travel demand management tools
Abstract
To increase its attractiveness for employees, to save costs regarding parking supply and to foster modal shift away from the car, employers can offer sharply cost-reduced public transport tickets. In the state of Hesse/Germany, public authorities have gone one step further by introducing a cost-free public transport ticket for all state employees. We argue that the step from sharply cost-reduced to cost-free is more than just a monetary difference. The aim of this study is to assess whether the ticket is actually affecting employees and what changed their travel behaviour. Therefore, we have analysed a two-wave survey conducted at Goethe University in Frankfurt: one from before and one from after the introduction of the new ticket. The results show a substantial increase in the use of public transport (pt) for commuting and other trip purposes. Car use and availability, however, did not decrease. In particular, those who had no cost-reduced jobticket beforehand switched to public transport after the introduction. Furthermore, we identified increasing public transport use for low-income employees (inclusion hypothesis) and several indicators pointing towards a more multimodal behaviour (multimodal hypothesis).
Highlights:
• Evaluation of three cycle street designs by means of visualisation assessments.
• Shared space is evaluated as the safest and most attractive cycle street design.
• The conventional urban street design is perceived as the most clearly structured.
• Affinity towards walking and cycling favours a positive evaluation of shared space.
Abstract
Cycle streets have been implemented in many urban areas around the world in recent years to make cycling safer and more attractive. In these streets, cyclists have priority over motorised traffic. They are allowed to use the entire roadway and determine traffic speed. However, there have been no standardised design guidelines for cycle streets to date. Moreover, there is limited understanding of the individual perception of different cycle street designs. Yet, positive evaluations of safety and attractiveness are especially important for pleasant travel in public spaces. Therefore, this study examines the individual perceptions of three cycle street designs: conventional, flow and shared space. Visualisations of these designs were implemented in a written household survey conducted in the urban Rhine-Main metropolitan region in Germany (n = 701). Participants were asked to assess the different designs in terms of safety, clarity, attractiveness and fun. Furthermore, bivariate analyses and regression models were performed to investigate whether individual travel preferences and attitudes, regular mode use and socio-demographic characteristics affect assessments of the designs. The results show that the shared space design is rated as the safest, most attractive and most fun. The conventional cycle street is evaluated as the most clearly structured. Individual affinity towards cycling and walking favours a good evaluation of the shared space design, while a high car affinity and having a migrant background positively affect the assessment of the conventional design. In addition, younger participants and members of households without a car assess the flow design more favourably.
Highlights
• Applies a biographically inspired practice-theoretical approach to understand everyday mobility from car-reduced neighborhoods.
• Investigates various ‘contexts’ and ‘practice bundles’ that shape car-(in)dependent mobility practices.
• Material, personal-temporal, and socio-cultural contexts of residents’ travel behavior in car-reduced neighborhoods stabilize and support car-independent mobility.
• The meanings (including emotions and feelings) of mobility practices determine their performance type.
• Calls for more car-reduced planning for the transition to low-carbon mobility.
Abstract
Lately, transport researchers and practitioners are showing renewed interest in car-reduced neighborhoods and their residents’ mobility to investigate possible factors influencing sustainable transport. With a biographically inspired practice-theoretical approach, this study considers the ‘context of travel behavior’ and, thus, focuses on mobility as a ‘practice’ in order to improve the understanding of everyday mobility as well as the potential and limitations of implementing car-reduced housing. Based on qualitative interviews with residents of two German car-reduced neighborhoods, we first identify different compositions of materials, competences, and meanings (including the feelings and emotions) of car-(in)dependent mobility practices. Second, we discover the personal, social, temporal, and socio-structural circumstances of the residents’ travel behavior alongside ‘practice bundles’ that interact with car-(in)dependent mobility. Finally, our findings indicate, on the one hand, that the car-centric material context outside car-reduced neighborhoods, the incorporation of private car driving with the practice of everyday life, and the affective satisfaction with car use and ownership negatively influence car independence. On the other hand, our results highlight that residential location and its materiality in the case of car-reduced housing developments, as well as the personal-temporal and socio-cultural contexts of their residents’ mobility practices stabilize and support car independence and low-carbon mobility.
Highlights
• Compares narratives and mobility-related practices of car-reduced neighborhoods.
• Identifies commonalities and differences between the ideal vision and the lived practice of car independency.
• The article concludes that a 'post-car system' requires continuous material and immaterial change.
• This can be fostered by political and planning readiness, as well as local willingness and public acceptability.
• Overall, this study reveals the exemplary role of car-reduced neighborhoods for mobility transition.
Abstract
In the pursuit of sustainability, the concept of ‘car-reduced neighborhoods’ promises to decrease car ownership and increase car-independent mobility. However, mobility is not only designed from ‘above’ by planners and policymakers, but also shaped from ‘below’ by its practitioners and their contexts. Only a few studies currently bring together the perspective from ‘above’ and ‘below’ regarding car-reduced neighborhoods. This article therefore combines both perspectives by contrasting the narratives and the mobility-related practices of two German car-reduced urban residential areas. Firstly, we conduct interviews with various actors involved in the planning and implementation of both neighborhoods to identify the narratives. Secondly, we interview the residents to determine the mobility-related practices. Finally, we compare both empirical investigations to analyze the commonalities and differences of the ‘planning vision’ and the ‘lived practice’ of car-free living, car-independent mobility, and restrictive car parking. Although this study identifies differences between the two perspectives, the discrepancy is smaller than evaluated in earlier studies. After relocating to a car-reduced neighborhood, residents tend to maintain, strengthen, and adapt car-independent mobility practices rather than weakening car-independent mobility practices and maintaining car-dependent ones. Thus, residents seem to be encouraged to drive less and to leave their cars parked for most of the time. However, relocating to a car-reduced neighborhood does not automatically initiate full demotorization. Furthermore, residents' parking practices also sometimes deviate from the planning vision. Consequently, the article concludes that overcoming the ‘system’ of automobility for a ‘post-car system’ requires continuous (i) material and (ii) immaterial change fostered by political and planning readiness, as well as local willingness and public acceptability. In this regard, car-reduced neighborhoods can be seen as blueprints for a mobility transition.
Highlights
• Explanation of mobility design and its practical, aesthetic and emblematic effects on travel behaviour.
• Review of recent studies on mobility design elements and the promotion of non-motorised travel.
• Discussion of research gaps and methodological challenges of data collection and comparability.
Abstract
To promote non-motorised travel, many travel behaviour studies acknowledge the importance of the built environment to modal choice, for example with its density or mix of uses. From a mobility design theory perspective, however, objects and environments affect human perceptions, assessments and behaviour in at least three different ways: by their practical, aesthetic and emblematic functions. This review of existing evidence will argue that travel behaviour research has so far mainly focused on the practical function of the built environment. For that purpose, we systematically identified 56 relevant studies on the impacts of the built environment on non-motorised travel behaviour in the Web of Science database. The focus of research on the practical design function primary involves land use distribution, street network connectivity and the presence of walking and cycling facilities. Only a small number of papers address the aesthetic and emblematic functions. These show that the perceived attractiveness of an environment and evoked feelings of traffic safety increase the likelihood of walking and cycling. However, from a mobility design perspective, the results of the review indicate a gap regarding comprehensive research on the effects of the aesthetic and emblematic functions of the built environment. Further research involving these functions might contribute to a better understanding of how to promote non-motorised travel more effectively. Moreover, limitations related to survey techniques, regional distribution and the comparability of results were identified.