system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - why do large trucks, busses etc. have larger steering wheels than smaller vehicles?
gpt
When there's more weight resting on the wheels, they are harder to turn. Having a larger steering wheel makes that easier to overcome.

Even though pretty much all vehicles now have power steering, you still need to be able to steer the vehicle in case of a failure, so they still have large wheels in spite of this.