Which rule can help you determine if you are driving at a safe speed?

The four-second sight distance rule is a valuable guideline for assessing safe driving speed. This rule essentially states that a driver should be able to see obstacles or hazards in the road ahead and have enough time to react appropriately if needed. By allowing for a four-second distance of visibility, drivers can better gauge their speed in relation to the conditions of the road, surrounding traffic, and any potential dangers. This buffer time provides the necessary window for a driver to perceive an obstacle, react to it, and then take action to avoid a collision or another incident.

This rule takes into account not only the speed of the vehicle but also the perception and reaction time of the driver. The greater the speed, the longer the distance needed to stop or maneuver away from a dangerous situation. The four-second sight distance rule helps ensure that drivers maintain a speed that allows for safe stopping or evasive action, particularly in variable driving conditions such as wet or icy roads.