In a center-opening horizontal door system, what is the term for the hoistway door engaged by the car door?

In a center-opening horizontal door system, the term for the hoistway door that is engaged by the car door is known as the "drive door." This design is specifically set up so that as the elevator car approaches a landing, the operation of the car door directly affects the opening of the hoistway door, allowing for a smooth and synchronized entry and exit.

The drive door is integral to the operation of the system, as it typically remains closed until the car door has reached its open position. This ensures passenger safety and helps to create a sealed environment within the elevator shaft when the elevator car is not present.

The other terms may refer to different aspects or configurations of door systems. Trailing door, for instance, typically refers to the door that closes after the lead door in a paired or sliding door system, while the lead door would be the first to open in such a configuration. A static door would refer to a fixed door that does not move in conjunction with the car door. Thus, the terminology accurately reflects the functional relationship between the car door and hoistway door in this system.