A Speed Limit Sign is a traffic sign that indicates the maximum speed allowed for vehicles on a particular road. These signs are usually posted along highways and streets to help ensure the safety of drivers, passengers, and pedestrians. The speed limit is typically measured in miles per hour (mph) or kilometers per hour (km/h), depending on the country. Speed limits can vary based on factors such as road type, location, and weather conditions. For example, urban areas often have lower speed limits than rural highways. Adhering to the speed limit is important for reducing accidents and promoting safe driving practices.