Why is there a standard size for roadside parking space markings?

[McKatherine]

According to the national 'Road Traffic Signs and Markings': 1. Free parking: Parking spaces marked with blue lines are free. 2. Paid parking: Parking spaces marked with white lines are paid. 3. Special parking: Parking spaces marked with yellow lines are designated for special use. The dimensions of parking spaces are as follows: 1. Straight parking space: The length of a straight parking space ranges from 5 meters to 5.5 meters, with a width requirement of 2.3-2.5 meters and a standard line width of 15 centimeters. 2. Angled parking space: The length requirement for an angled parking space is 6-8 meters, with a width requirement of 2.8-3 meters and an inclination angle of 60°. 3. Medium bus and truck parking space: Width of 3.0 meters and length greater than 6 meters. 4. Large bus parking space: Based on the current design standards for large buses, which are generally around 10-12 meters in length, the width is ensured to be 4 meters, and the parking space length is determined considering the turning radius.