Final answer:
In urban residential areas, the speed limit is typically 30 miles per hour. This converts to about 50 kilometers per hour, whereas interstate highways may have speed limits around 60 miles per hour or 96 kilometers per hour.
Step-by-step explanation:
In most urban residential areas, vehicles may not exceed 30 miles per hour or the posted speed limit. This speed limit is designed to ensure safety for all road users, including pedestrians, and is established considering the average size and speed of vehicles, as well as pedestrian crossing times. Even though speedometers might not be highly accurate, it's important to adhere to speed limits to avoid traffic infractions and ensure safety.
Interestingly, while the typical residential speed limit in the United States is 30 mph, this translates to about 50 kilometers per hour in countries using the metric system. It is also noteworthy that speed limits on some interstate highways may reach around 60 miles per hour (approximately 96 km/h or 27 m/s), which is much higher than residential limits.