Which Point on the Wiper to Look at for 30 Centimeters?
3 Answers
30 centimeters is measured by looking at the position between the right wiper's root and the right washer nozzle. Below are related instructions: 1. Look at the engine hood: From the driver's perspective, when one-third of the front of the car aligns with the right lane edge line, you can stop. Be sure to slow down and follow the principle of quick steering and quick return, turning as much as you return. 2. Look at the right door handle: You can observe the right door handle through the right rearview mirror. When it aligns or just touches the roadside line, the distance is also about 30cm. If parking is improperly close to the curb, and the tire rubs against and is squeezed by the curb, the damage to the tire is very significant, and it may even cause bulging or damage to the tire.
I've been driving for decades and have taught this technique to many beginners. The reference point for judging a 30 cm distance is usually at the bend or raised node of the left wiper arm. When you're seated in the driver's position and adjust your view along the hood, if that point aligns or coincides with the roadside line, it indicates the outer edge of the wheel is approximately 30 cm from the curb. This method stems from experienced drivers' wisdom and is highly practical, but it's important to note that each car's design differs; the reference point position may vary significantly between SUVs and sedans. I practiced with my own car by placing a measuring tape on an open ground to verify the accuracy of the reference point. The key is to also observe the vehicle's position using side mirrors to avoid relying solely on one reference point. Vehicle maintenance, such as aging suspension, can affect the accuracy of the reference point, so I check my car's condition every six months. Safety always comes first, especially at night or during rain when the wipers are moving and the reference point may become unstable—slow down and observe more to ensure absolute safety.
I just learned to drive recently and am both curious and confused about this 30-centimeter wiper technique. The instructor mentioned a small bump or crease point on the wiper arm as a reference position—aligning that point with the roadside line from the driver's seat can estimate a 30-centimeter distance. I've tried it a few times when parking, sometimes it's accurate but other times the deviation is large. I found it easier to control during slow movement. Additional note: seat height adjustment can affect the line of sight, so beginners should ideally have a partner step out to check the actual distance and calibrate the point. When the headlights are on, that point might reflect or blur, so practicing during the day is more effective. I think this method is interesting and can complement safety techniques, such as also checking the side mirror or gradually approaching the curb by feel—don’t just focus on the point and ignore the overall environment. With more practice, spatial awareness will improve.
