How should a driver operating an automated manual transmission (AMT) bus approach an uphill gradient to maintain passenger comfort and avoid driveline shudder?

1. Allow the transmission to auto-shift at minimum engine RPM while climbing the steepest section
2. Anticipate the gradient early, switch to manual mode if necessary, and pre-select a gear that keeps the engine in its optimal torque band without hunting
3. Depress the accelerator pedal to kickdown repeatedly throughout the entire climb
4. Apply the retarder step 3 while simultaneously applying full throttle