What are the 30cm reference objects?
2 Answers
30cm reference objects include wipers, car front reinforcement ribs, and door handles. Wipers: Different coaches may have different methods. For example, observing the wipers: when the gap of the wipers aligns with the sideline while moving forward, the distance between the car body and the sideline is approximately 30cm. Car front reinforcement ribs: These are the raised lines on the right side of the car front. When the reinforcement ribs align with the sideline while moving forward, the distance is also about 30cm. As for which reference to choose, it's best to discuss with your coach first. Door handles: The door handles in the rearview mirror can also serve as a reference. Observe the distance between the right side of the car body and the road edge. When the door handles just cover the curb or make contact, the distance between the car body and the roadside is generally within 30cm without crossing the line.
When I want to measure tire wear or interior space, I often look for objects around 30 cm long as references. A standard A4 sheet of paper is almost 30 cm long, making it convenient to place behind the car to check parking distance. Medium-length screwdrivers or wrenches from the toolbox might also fit this size, useful for estimating clearance in the engine bay. During modifications, I use them to ensure new components don't interfere with the body, saving the hassle of carrying a tape measure. These references make my daily maintenance more flexible and efficient, especially for quickly assessing no-scratch situations after emergency stops. Remember to stay safe and regularly clean tools to prevent rust from affecting accuracy.
