What is the proper distance for oncoming traffic in Subject 3 driving test?

[Frodo]

When encountering oncoming traffic, it's best to maintain a 30 cm distance between the right side of your vehicle and the solid line on the right lane. Here are the relevant details: Oncoming traffic: This refers to two moving vehicles passing each other at a certain point, as you'll inevitably encounter narrow roads during actual driving. Subject 3 oncoming traffic scoring rules: 1) Failing to slow down and keep right when meeting oncoming traffic on roads without central separation facilities or centerlines, or failing to maintain safe distance from other vehicles, pedestrians, or non-motorized vehicles - 100-point deduction; 2) Not yielding when passing is difficult - 100-point deduction; 3) Poor judgment of lateral safety distance resulting in emergency steering to avoid oncoming vehicles - 100-point deduction.