During taxi procedures, the pilot should follow the yellow lines, to avoid a collision with any obstacle or even with another aircraft. Is the any situation, which the pilot can deviate from the yellow line at their own discretion?
There's no rule that you have to follow the lines, they're there purely as a guide, a reference for pilots to know where the center of the taxi lane is. Following it is at a pilot's discretion, to be deviated from at any point. Generally you follow the line because it's easy and it should keep you out of trouble, common reasons for deviating are:
- Obstructions: vehicles, people, debris
- Clearance: airplanes with large wingspans may need to hug one side of a taxiway to get around parked airplanes or buildings. In a small airfield you'll often have to get around a parked airplane or two