The significance of a car having no engine can vary depending on the context, but here are several points to consider:

Environmentally Friendly: An engine-less car, often called a "push car" or "coaster," doesn't emit pollutants or greenhouse gases during operation, making it environmentally friendly.

Energy Efficiency: Without an engine, the car doesn't consume fuel or electricity, contributing to energy conservation. This can be particularly relevant when energy resources are scarce or expensive.

Reduced Maintenance Costs: Engines require regular maintenance, such as oil changes, filter replacements, and tune-ups. Eliminating the engine means eliminating these maintenance tasks and associated costs.

Simplicity: A car without an engine is mechanically simpler. It doesn't have complex systems like fuel injection, ignition, or exhaust systems, which can reduce the likelihood of mechanical failures and make repairs easier.

Lower Weight: Engines are typically heavy components of a vehicle. Removing the engine reduces the car's overall weight, which can improve handling, braking, and overall performance.

Versatility: Engine-less cars can be repurposed for various purposes. They can serve as educational tools to demonstrate basic automotive principles, props in movies or theater productions, or decorative items in museums or exhibitions.

Training and Education: Engine-less cars are valuable for educational purposes, allowing students and enthusiasts to learn about automotive mechanics, design, and engineering without the complexity and safety concerns associated with operating a functioning vehicle.

Art and Creativity: Some artists and designers use engine-less cars as canvases for creative projects, transforming them into sculptures, installations, or functional art pieces that explore themes like sustainability, transportation, or societal issues.

Historical Significance: Engine-less cars, particularly vintage models, can hold historical significance, representing a specific era or technological development in automotive history. Preserving these vehicles provides insight into the evolution of transportation.

Challenges and Limitations: While engine-less cars offer several advantages, they also come with limitations. They cannot be driven under their own power, relying on external means of propulsion such as towing or pushing. Additionally, they may lack practicality for everyday transportation needs.

In summary, the significance of a car without an engine lies in its environmental friendliness, simplicity, reduced maintenance costs, versatility, and potential for educational and artistic purposes. However, it also comes with limitations in terms of practicality and functionality for regular transportation.