Congestion charges were introduced in Stockholm in 2006, first as a trial followed by a referendum, then permanently from 2007. This paper discusses what conclusions can be drawn from the first five years of operation, until mid-2011. We show that the traffic reduction caused by the charges has increased slightly over time, once external factors are controlled for. Alternative-fuel vehicles were exempt from the charges through 2008, and we show that this substantially increased the sales of such vehicles. We discuss public and political acceptability, synthesizing recent research and Swedish experience. We conclude that objective and subjective effects on the traffic system, as well as general environmental and political attitudes, formed the basis of the strong public support, while institutional reforms and resolution of power issues were necessary to gain political support. Finally, we briefly discuss implications for the transport planning process in general.
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... What about working-class folks?" These inputs are combined with academic literature retrieved from sources such as Google Scholar on prior congestion pricing implementations in cities like Stockholm (Chronopoulos, 2012;Börjesson et al., 2012). It proposes a preliminary hypothesis, which is then refined by the Urban Scientist through contextual knowledge of NYC's transit systems and demographic structure. ...
Urban causal research is essential for understanding the complex dynamics of cities and informing evidence-based policies. However, it is challenged by the inefficiency and bias of hypothesis generation, barriers to multimodal data complexity, and the methodological fragility of causal experimentation. Recent advances in large language models (LLMs) present an opportunity to rethink how urban causal analysis is conducted. This Perspective examines current urban causal research by analyzing taxonomies that categorize research topics, data sources, and methodological approaches to identify structural gaps. We then introduce an LLM-driven conceptual framework, AutoUrbanCI, composed of four distinct modular agents responsible for hypothesis generation, data engineering, experiment design and execution, and results interpretation with policy recommendations. We propose evaluation criteria for rigor and transparency and reflect on implications for human-AI collaboration, equity, and accountability. We call for a new research agenda that embraces AI-augmented workflows not as replacements for human expertise but as tools to broaden participation, improve reproducibility, and unlock more inclusive forms of urban causal reasoning.
... Toll taxes, for instance, have long been employed to regulate traffic on highways and bridges, charging users for access and thereby incentivizing more efficient transportation behaviors. Similarly, congestion charges in city centers, such as those implemented in London or Stockholm, aim to reduce road congestion by imposing fees on vehicles entering high-traffic areas during peak times (Börjesson et al. 2012;Gibson and Carnovale 2015). ...
We present a model of a two-segment tourist destination where there are externalities of congestion, both within and across segments. We show that when intersegment sensitivity to congestion from low to high category is sufficiently large, then a well-designed per-person tourist tax can increase local social welfare, while also increasing industry aggregate profit. In particular, it is profit maximizing to only tax the low segment, until it creates no externality on the high segment. Intervention is more likely to be optimal when the high category segment would be sufficiently more profitable (absent intersegment congestion) than the low category one. While a uniform tax on both segments may increase local welfare, it always decreases aggregate industry profits.
This chapter examines the institutional environment in which new transportation technologies are being introduced within the United States. We focus on four broad technology categories: Shared mobility, integrated mobility, priced mobility, and autonomous mobility to illustrate the potential transformations to the transportation system and the institutional obstacles to adoption at scale. We identify two overarching themes to conceptualize how transportation innovations interact with the existing technology. First, the omnipresence of transportation in the public sphere and in people’s daily lives sets transportation technologies apart from other areas of rapid innovation that are more clearly in the private or public sector. Second, transportation technologies have the potential to significantly reshape land use, which greatly expands the scope of change to how cities function and develop. We use these themes to synthesize the literature and formulate a set of recommendations to steer innovations in the direction of equitably distributed benefits.
This paper examines the development of urban transport political agendas in three Nordic capital cities, Helsinki, Oslo, and Stockholm, that strive towards urban sustainability. Utilising the Multiple Streams framework as a basis for analysis, an overview of local problems, policy solutions, and politics that have characterised transport systems and the related policy development processes over time is constructed. The attention is then drawn towards the points in time where the streams connect, and policy windows occur, to detect formative changes and their enablers towards sustainability. The data consists of 18 semi‐structured expert interviews, conducted amongst municipal policymakers and planners. The results reveal several policy windows that have transformed the local transport systems towards sustainability and an increasingly people‐oriented approach. The relevance of global climate change awareness, international planning trends for liveability and cycling, public pressure, individual political decisions, and establishment of modal hierarchy is evident across the case cities, while car traffic regulation is politically challenging and addressed through very different means at very different times. The findings of this paper outline diverse ways for advancing sustainability in local policy development but also detect methods for politically halting the process.
Studies of the “stated preferences” of households generally report public and political opposition by urban commuters to congestion pricing. It is thought that this opposition inhibits or precludes tolls and pricing systems that would enhance efficiency in the use of scarce roadways. This paper analyzes the only case in which road pricing was decided by a citizen referendum on the basis of experience with a specific pricing system. The city of Stockholm introduced a toll system for seven months in 2006, after which citizens voted on its permanent adoption. We match precinct voting records to citizen commute times and costs by traffic zone, and we analyze patterns of voting in response to economic and political incentives. We document political and ideological incentives for citizen choice, but we also find that the pattern of time savings and incremental costs exerts a powerful influence on voting behavior. In this instance, at least, citizen voters behave as if they value commute time highly. When they have experienced first-hand the out-of-pocket costs and time-savings of a specific pricing scheme, they are prepared to adopt freely policies which reduce congestion on urban motorways.