What are two indicators for when to shift gears?

Shifting gears at the appropriate time is crucial for maintaining vehicle performance and efficiency, especially in commercial driving. Engine RPMs (Revolutions Per Minute) is one of the primary indicators, as they show how hard the engine is working. When the RPMs reach a specific threshold, indicating that the engine is operating efficiently or close to its maximum capacity, it often signals the need for a gear change. This is essential for preventing engine strain and improving fuel economy.

Road speed is another critical factor. As the vehicle accelerates or decelerates, changes in speed can necessitate shifting to ensure optimal power and control. For instance, when taking off from a stop, the driver should be in a lower gear to maximize torque, while higher gears are more suitable for sustained speeds on the highway. Monitoring both RPMs and road speed allows drivers to make timely decisions about when to shift gears, enhancing safety and the overall driving experience.