How is the speed limit typically enforced?

Using radar speed detectors is a common and effective method for enforcing speed limits. Radar technology enables law enforcement personnel to accurately measure the speed of vehicles as they pass by. This technology helps officers gather concrete evidence of speeding, which can then be used to issue citations and reinforce adherence to traffic laws.

The radar detectors work by emitting radio waves that bounce off moving vehicles, calculating their speed based on the change in frequency of the returned waves. This method provides an objective measurement that doesn't rely on subjective interpretations, unlike the other options, which may lack reliability or verification.

For instance, relying solely on observing traffic patterns can be imprecise; it may not accurately reflect individual vehicle speeds. Similarly, basing enforcement on driver testimonies is not a reliable method since personal accounts can be biased or inaccurate. Lastly, offering incentives for compliance does promote safer driving but does not directly address enforcement of actual speed limits on the road. Therefore, using radar speed detectors stands out as the most direct and substantiated method of speed limit enforcement.