Which of the following is NOT a post-start check for a forklift?

The correct choice indicates that checking the transmission fluid is not typically part of a post-start check for a forklift. Post-start checks are routine inspections conducted after starting the forklift to ensure that various critical safety and operational systems are functioning properly before the equipment is put to use.

The horn and lights are essential for safety, allowing communication with pedestrians and other vehicles, while also ensuring visibility. These checks are vital as they help prevent accidents and ensure the forklift can be used safely in its operating environment. Battery checks might also be conducted to ensure the power source is adequate for the operation.

In contrast, transmission fluid checks are generally performed as part of regular maintenance rather than being a routine post-start check. This is because transmission fluid levels are not as critical to immediate safe operation as the other systems mentioned. Regular maintenance checks would cover transmission fluid as part of ongoing upkeep rather than a quick safety check before use.