Internal combustion engines are not considered energy efficiency technologies because they rely on the combustion of fossil fuels, which is a relatively inefficient process.

Energy efficiency technologies in transportation offer multiple benefits, including reduced energy consumption, lower emissions, and improved performance.

Regenerative braking systems convert the kinetic energy of a vehicle during braking into electrical energy, which can be stored and used to power the vehicle.

Electric vehicles offer multiple benefits in terms of reducing greenhouse gas emissions, including zero tailpipe emissions, the use of renewable energy sources, and improved efficiency compared to gasoline vehicles.

Fuel cells use hydrogen as a fuel source to generate electricity through an electrochemical reaction, which powers the vehicle.

The widespread adoption of electric vehicles faces several challenges, including high cost, lack of charging infrastructure, and limited driving range.

Energy efficiency technologies can improve the overall performance of vehicles by providing increased acceleration, enhanced handling, and improved fuel economy.

Trolleybuses are electric vehicles that draw power from overhead wires through trolley poles, making them a common choice for public transportation systems.

Hybrid vehicles offer multiple advantages over conventional gasoline vehicles, including improved fuel economy, lower emissions, and enhanced performance.

Thermoelectric generators utilize the Seebeck effect to convert waste heat into electricity, offering potential applications in transportation systems.

Energy efficiency technologies in transportation contribute to reducing the environmental impact by lowering greenhouse gas emissions, improving air quality, and reducing noise pollution.

The implementation of energy efficiency technologies in transportation faces several challenges, including high cost, lack of infrastructure, and consumer resistance to change.

Batteries are energy storage devices that can store electrical energy and release it when needed, making them essential components of electric vehicles and hybrid vehicles.

Energy efficiency technologies in transportation contribute to improving the sustainability of transportation systems by reducing energy consumption, lowering emissions, and enhancing mobility.

Active grille shutters are devices that automatically adjust the size of the grille opening to reduce aerodynamic drag, thereby improving fuel efficiency.