Final answer:
We must signal at least 100 feet before a turn, and the rule applies regardless of the speed limit. The exact speed limit where this is enforceable may depend on the jurisdiction.
Step-by-step explanation:
When discussing the rules of the road, it's important to note that we must start to signal at least 100 feet before a turn regardless of the specific speed limit. However, the exact speed limit at which this rule applies may vary by jurisdiction. Speed limits are enforced to ensure safety on the roads, and signaling in advance of a turn provides other drivers with enough time to react to your intended actions. Although speed limits on some interstate highways can reach approximately 100 km/h (about 62 mph), local speed limits, particularly in towns, cities, or residential areas, are often much lower. For instance, in an area with a 30 mph speed limit, the rule still applies to signal at least 100 feet before you turn.