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The Glasgow trial forms part of a wider global initiative examining the impact of incentives, credits, and rewards in encouraging sustainable travel habits. As cities around the world contend with issues such as traffic congestion, air pollution, and the demand for more sustainable transport networks, a range of incentive-driven schemes have been introduced to promote public transport use. Among the most notable are mobility credits, where individuals receive funds to spend on sustainable travel options via pre-paid cards or mobility-as-a-service apps, along with financial discounts.
This article explores global case studies, evaluating the effectiveness of such initiatives and considering whether they alone can drive long-term change towards more sustainable travel behaviours.
Photo source: First Bus
Luxembourg: The first fully free public transport system
In 2020, Luxembourg became the first country to make all public transport free for residents and tourists. The move aimed to ease traffic congestion, promote equality, and meet environmental targets. Before the scheme, public transport fares were already relatively low, meaning no immediate modal shift was expected. However, in the long term, the elimination of ticketing is anticipated to encourage spontaneous usage and increase awareness of Luxembourg’s strong public transport offer. While the scheme has improved accessibility and reduced financial barriers to transport, critics argue that congestion remains a challenge, as many commuters continue to rely on private cars. The policy’s long-term sustainability remains uncertain, particularly regarding funding and public transport capacity.
Photo source: Euroactiv
San Francisco Bay Area: incentivising active and shared travel
The "Incentivizing Active and Shared Travel" pilot in San Francisco sought to reduce single-occupancy vehicle trips by offering financial rewards for using public transport, carpooling, cycling, or walking. The initiative saw a notable shift in weekday travel behaviour, with increased adoption of sustainable travel options. However, the study also revealed that information alone was insufficient; successful behavioural change required well-structured incentives that addressed access, convenience, and user habits.
Photo source: The Behaviouralist
Coventry: Mobility credits schemes
Coventry City Council’s mobility initiative provides a model for using mobility credits as an alternative to private car use. Under the scheme, residents were offered the opportunity to exchange an older, polluting vehicle for £3,000 worth of mobility credits, which could be used on public transport, bike hire, or other sustainable travel modes. Results indicated that travel habits settled after participation, suggesting a lasting modal shift among users.
Additionally, Coventry provides mobility credits to residents moving into certain new developments. These credits can be redeemed for public transport and cycle hire within the West Midlands or exchanged for cycle vouchers to purchase bicycles and accessories. While still in its early stages, this initiative demonstrates a model for other cities looking to implement similar measures.
Photo source: TransportXtra
In 2024, a trial in Queensland introduced a flat fare of 50 cents for all public transport zones, leading to an 11% increase in ridership within a week, with over four million trips recorded. After six months, ridership had increased by 18.3% compared to the previous year. In total, the government estimated that customers had saved around $181 million. The overwhelming success of the initiative resulted in political commitments to maintain affordable fares, reinforcing the potential of price reductions to boost public transport use. However, questions remain about the financial sustainability of such schemes in the long term.
Conversely, not all fare reductions lead to increased ridership. Transport for London trialled an off-peak fare structure on Fridays to encourage a return to office commuting, but reported no significant rise in passenger numbers. This suggests that cost alone is not the sole factor influencing commuter choices, with trends such as remote working and journey convenience playing significant roles.
Photo source: The Australian
Alongside mobility credits and fare reductions, reward and loyalty schemes have emerged as effective tools for encouraging sustainable travel behaviour. These schemes offer incentives, such as points, discounts, or vouchers to individuals who choose public transport, active travel, or shared mobility over private car use. By gamifying sustainable travel and making environmentally friendly choices more rewarding, they can foster long-term behavioural change.
Several organisations and initiatives are leading the way in promoting sustainable travel through rewards. BetterPoints, an app-based rewards programme, allows users to earn points for walking, cycling, and using public transport. Points can be exchanged for high-street vouchers or donated to charities, providing both a personal and social incentive for sustainable travel. BetterPoints has been successfully deployed in various UK cities, demonstrating notable shifts in travel habits and increased engagement with active travel modes. Similarly, Lowr is a sustainable travel rewards platform that enables users to earn discounts and win perks by choosing low-carbon transport options. The scheme partners with local businesses, event organisers and transport providers to offer incentives that align with regional sustainability goals, encouraging habitual changes in commuting and leisure travel.
Reward schemes help overcome common barriers to sustainable travel, such as convenience, cost, and ingrained habits. Unlike one-off fare reductions, ongoing rewards help reinforce positive habits, making sustainable travel choices more habitual and desirable. However, for reward schemes to be truly effective, they must be well-integrated with broader transport policies and infrastructure. Cities with well-connected, reliable, and frequent public transport services see higher uptake of such schemes. Additionally, clear and engaging marketing is essential to ensure that users understand and utilise these incentives.
Photo source: BetterPoints
Many major events have incorporated the cost of public transport into the price of event tickets during major occasions to reduce congestion and promote sustainable travel habits.
For example:
· at the London 2012 Olympic Games, providing including the use of public transport for ticketholders within the event ticket, alongside measures to influence the travel behaviour of regular commuters, helped prevent the transport network from becoming overwhelmed. These initiatives led to an additional one million passenger journeys per day on London’s already crowded public transport system, yet congestion remained manageable as travellers spread their journeys throughout the day and across the network.
· similarly, at the UEFA Euro 2024 Championships, public transport was included in the cost of event tickets, leading to significant uptake and a reduced carbon footprint of the overall event. However, Germany’s railway infrastructure faced criticism from eventgoers who experienced delays and service disruptions.
While these schemes generally succeed in encouraging public transport use, their effectiveness depends on the system's capacity to handle increased demand.
Photo source: AP News
Mobility credits and other incentives and provide an alternative to private vehicle use and can promote sustainable travel across different groups effectively. Key benefits and challenges from global case studies include:
Health and environmental benefits
Economic and social benefits
While mobility credits and financial incentives have demonstrated success in increasing public transport use, they are not standalone solutions. Their effectiveness depends on:
Mobility credits and fare discounts can play a significant role in shifting travel behaviour, reducing congestion, and supporting environmental goals. However, their success hinges on careful implementation, integration with broader transport policies, and sustainable funding mechanisms. While financial incentives can encourage short-term changes, long-term sustainability requires a holistic approach that includes improved public transport infrastructure, urban design reforms, and ongoing policy support.
A key question remains around funding: Should free or discounted travel be a long-term solution, or are short-term trials sufficient to embed behaviour change, leading to self-sustaining habits? Whilst some schemes have been funded through local transport authorities, private property developments, and event organisers, but whether such funding models are viable in the long term is still an open question. Cities considering mobility incentive schemes must take a comprehensive approach to ensure these initiatives translate into lasting and meaningful change.
One promising strategy is to align incentives with key transition points in people’s lives, drawing on behaviour change principles. For instance, providing three months of free or discounted travel when someone moves house or registers for Council Tax, an approach trialled by Coventry Council’s new home credits scheme, could help embed new travel habits during periods of routine change.
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