What are the main challenges to implementing sustainable transport?

Despite growing momentum, implementing sustainable transport systems faces a complex set of challenges that span technology, governance, finance, infrastructure and even cultural resistance to change.

The transport sector remains deeply dependent on fossil fuels, with oil powering the vast majority of vehicles, ships and aircraft. Fossil fuel subsidies continue to distort markets, making low-emission alternatives less competitive. The high upfront costs for electric vehicles, charging infrastructure, port and airport upgrades, and system-wide transitions remain a significant barrier, especially in low- and middle-income countries. While long-term savings are well established, many governments and operators struggle to access the capital and financing needed to make these investments.

In many low- and middle-income countries, the successful adoption of e-mobility depends on prior improvements in energy access and grid reliability. Without these foundational investments, electric vehicles risk overwhelming already fragile power systems, while underutilized charging infrastructure may become stranded assets. However, when planned in an integrated manner, e-mobility and energy access initiatives can be mutually reinforcing. For example, electric two- and three-wheelers can serve not only as transport solutions but also as mobile energy storage units, supporting distributed energy systems and enhancing energy resilience in underserved areas.

There are also major policy and regulatory gaps. Many countries lack coherent transport strategies, fuel and emissions standards, or frameworks that support vehicle electrification, modal shift, circular economy practices and the decarbonization of aviation and shipping. Inconsistent policies between energy and transport sectors further undermine progress. A whole-of-government approach, aligning infrastructure planning, electricity generation and urban development, is essential but often missing. Enabling energy infrastructure is another critical constraint. In many countries, the electric grid is not yet prepared to handle the increased demand from large-scale vehicle electrification.

Beyond infrastructure, the organization of the transport sector itself can be a barrier. In many urban areas, public transport systems are fragmented, under-regulated, or run through outdated concession models. In some regions, informal operators fill gaps in service but make integrated planning difficult. In such contexts, reorganizing routes, rationalizing services and introducing coordinated regulation can deliver more impact than technology switching alone.

Freight, shipping and aviation also face specific challenges. These include the complexity of cross-border logistics, fragmented supply chains and the lack of scalable low-carbon fuels. Hard-to-abate sectors like long-haul freight and aviation require both technological innovation and global policy coordination.

Finally, many countries face technology and data constraints. Limited access to real-time analytics, digital mobility platforms and vehicle-grid integration tools slows down smart infrastructure deployment. Meanwhile, circularity and waste management, especially for batteries, ship components and aircraft materials, remain in early stages, with few large-scale solutions for reuse, recycling and safe disposal.

Overcoming these barriers requires an integrated approach that combines regulatory reform, investment in enabling energy systems, institutional coordination, urban planning, digital innovation and stakeholder engagement, grounded in both climate resilience and long-term sustainability.