In dense traffic, only a small proportion of the vehicle's performance is needed to keep it moving.
For a powerful vehicle, second gear is adequate when accelerating from a standstill.
A stop-and-go situation is identified if the throttle opening angle and the road speed remain below pre-set limits for a given period of time.
This prevents shifting down to first gear.
That makes progress smoother, lowers fuel consumption and reduces any tendency to creep forward from a standstill.
When the pre-set load/speed range is exceeded, first gear is no longer inhibited.
