Does the rear door of a transit bus need to be open in order to engage the parking brake?

The correct understanding is that the rear door of a transit bus does not need to be open in order to engage the parking brake. This means that you can engage the parking brake safely even if the bus's rear door is closed.

Most transit buses are designed to allow the engagement of the parking brake regardless of the rear door's position. The system is in place to ensure that drivers can secure the vehicle when necessary, enhancing safety by preventing unintended movement of the bus.

While there may be specific bus models or systems where this could vary, the general operation and design of transit buses do not require the rear door to be open for the parking brake to function.

Other options suggest conditions that are either impractical or not applicable for standard operation, as engaging the parking brake is a crucial safety procedure that should remain unaffected by the state of the rear door.