A sedan seats four or more people and has a fixed roof that is full-height up to the rear window. The roof structure will typically have a fixed B-pillar on sedan models. Most commonly it is a four-door; two-door models are rare, but they do occur (more so historically). In the U.S., the term sedan has been used to denote a car with fixed window frames, as opposed to the hardtop style without a "B" pillar and where the sash, if any, winds down with the glass. However, true hardtops have become increasingly rare. Four-door sedans can have either two or three side windows: One in each door (vent windows not counted), and the possible third integrated in the "C"-pillar.
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