Transport energy conservation — AQA A-Level Environmental Science

This topic explores the critical intersection of engineering, policy, and human behaviour in reducing the energy demands of the transport sector. It covers technological advancements like lightweight materials and electric propulsion alongside systemic changes such as public transport integration and active travel infrastructure.

Understanding this is vital for addressing climate change and resource depletion, as transport is a major contributor to global greenhouse gas emissions. It links directly to broader environmental science themes like sustainable development, air pollution management, and energy security.

• →Energy intensity per passenger-kilometre (pkm)
• →Modal shift from private to public transport
• →Technological efficiency (aerodynamics, lightweighting, regenerative braking)
• →Urban planning and the '15-minute city' concept
• →Alternative fuels and propulsion systems

• Identifies a named piece of transport infrastructure, such as a dedicated bus lane or rail line, and links it to reduced energy use per passenger journey.
• Distinguishes a management system, such as congestion charging or traffic-signal optimisation, from a physical infrastructure asset.
• Explains a mechanism by which a management measure lowers energy demand, for example reducing idling or raising vehicle occupancy.
• Recognises that infrastructure and management work together, so a measure is more effective when both are present.

• 💡Read the question stem to see whether it asks for infrastructure, management or both before choosing.
• 💡Reject options that describe a single vehicle technology when the question concerns system-level infrastructure or management.
• 💡Check that the chosen option names a mechanism that reduces energy per journey, not just a general transport benefit.
• 💡Always provide a specific example when discussing policy, such as the London Congestion Charge or High-Speed Rail (HS2).
• 💡Use quantitative data where possible; examiners reward students who can explain the 'why' behind the numbers.

• Treats a management system such as a congestion charge as if it were a physical structure; classify it as a management measure instead.
• Assumes new infrastructure alone guarantees energy savings; add the management measures that control how it is used.
• Confuses energy conservation with emissions reduction only; state the link to reduced energy demand per journey.
• Assuming electric vehicles (EVs) are zero-energy: EVs still require energy to manufacture and charge, and their efficiency depends on the grid's energy mix.
• Ignoring the 'embodied energy' of transport infrastructure: Building new roads or rail lines carries a high initial energy cost that must be accounted for in life-cycle assessments.

1. 1Week 1: Review the physics of transport efficiency (drag, mass, and propulsion).
2. 2Week 1: Research case studies on modal shifts in European cities.
3. 3Week 2: Practice calculations comparing energy intensity of different transport modes.
4. 4Week 2: Evaluate the environmental impact of different fuel types (Hydrogen vs. Battery Electric).

• 📋Calculation questions: Focus on energy intensity (kWh/pkm).
• 📋Evaluate questions: Discuss the trade-offs of different transport policies.
• 📋Explain questions: Describe how specific technologies reduce energy waste.