What is the fastest method to find 30 centimeters on the left side of the car?

[McDallas]

The fastest method to find 30 centimeters on the left side of the car is to observe these reference points: when the left 1/3 of the car hood aligns with the left edge of the road, the left side of the car is approximately 30 centimeters from the roadside; when the position of the left wiper's rivet aligns with the right edge of the road, the car body is also about 30 centimeters from the edge; observe the left rearview mirror—when the car's door handle just touches the roadside line, the distance between the car body and the edge is roughly 30 centimeters. Additionally, when the left corner of the car hood (left headlight position) aligns with the road edge, the left side of the car is 30 centimeters from the edge; when viewing through the left rearview mirror, if the mirrored distance between the car body and the roadside is 10-15 centimeters (about 1-2 finger widths), the left side of the car is also approximately 30 centimeters from the roadside; when a point 10 cm to the right of the left corner of the windshield aligns with the left edge of the road, the car body is similarly about 30 centimeters from the edge. All test tracks have edge lines. Driving along the left edge line from a position slightly left of the center of the engine hood ensures that the left side of the tire is about 30 centimeters from the left edge. Aligning the left 15 centimeters of the car hood's center with the left edge line guarantees 30 centimeters, provided the car body is already parallel to the roadside. The prerequisite for using these reference points is adjusting the seat and posture correctly. It's not necessary to rely on a single method; combining several of the above techniques ensures the most accurate determination of the car's position.