What speed should be reached before shifting from number 1 gear?

The recommended speed for shifting from number 1 gear is approximately 5 mph. At this speed, the vehicle has reached a point where the engine can efficiently transition to a higher gear without straining the engine or causing unnecessary wear on the vehicle's drivetrain. Shifting at this speed allows for smoother acceleration and helps maintain the integrity of the transmission system.

Reaching speeds lower than 5 mph may hinder the vehicle's performance, making it less efficient when transitioning through the gears. Conversely, shifting too soon, or at a higher speed than advised, could put undue stress on the engine and lead to performance issues or damage over time. Understanding the proper shifting speeds is crucial for a school bus driver, as it ensures safe operation and longevity of the vehicle.