# Why Do Semi Truck Passenger Doors Have A Little Window At The Bottom?

> You've probably spotted that tiny window at the bottom of a semi truck's passenger door cruising on the highway. Most people confuse this for an aesthetic finish or even a pet window.

- **Source:** [SlashGear](https://www.slashgear.com/1867521/semi-truck-passenger-door-bottom-small-window-use-explained/?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6839ad40d3bdd0f80e371946)
- **Published:** 2025-05-30
- **Category:** Cars
- **Tags:** #nothing #window #bottom #passenger #semi #truck #doors #little
- **Canonical:** http://localhost:4321/a/6839ad40d3bdd0f80e371946

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_GearOpen's distilled summary. The full original article is published at SlashGear (source link above); GearOpen does not republish the source's full text._