Why does the Audi A1 have a smaller width than other models?

I was looking at the specs of the Audi A1 and noticed that it has a smaller width than most other models, such as the A3 or A4. Is there a particular reason for this?

The smaller width of the Audi A1 is due to its compact design, making it easier to maneuver in tight spaces and urban environments.

Audi intentionally designed the A1 to have a smaller width for better aerodynamics and fuel efficiency.

The smaller width of the Audi A1 may also contribute to its lighter weight, resulting in improved performance and handling.