Final answer:
Runway hold position markings on the taxiway are designed to hold aircraft short of the runway for safety and to manage airfield traffic, preventing collisions.
Step-by-step explanation:
The purpose for the runway hold position markings on the taxiway is to hold aircraft short of the runway. These markings indicate where a plane must stop to ensure it does not interfere with another aircraft that is taking off or landing. It's a safety measure to prevent collisions and to manage airfield traffic effectively. When a plane reaches these markings, it must wait there until cleared to enter or cross the runway by air traffic control. So the correct answer is that these markings are there to hold aircraft short of the runway.