Final answer:
Wheels should be 12 to 18 inches from the curb when parking, which is about 30 to 45 centimeters. This prevents traffic obstruction and complies with parking regulations.
Step-by-step explanation:
When parking next to a curb, your wheels should generally be within 12 to 18 inches (30 to 45 centimeters) from the curb. This distance ensures that your vehicle does not impede traffic flow and is safely within the parking zone marked by the curb. Regulations may vary slightly depending on the local traffic laws, so always check for any specific rules that may apply in the area where you are parking.