Idaho Written Driver's License Practice Test

The correct answer is that you should signal for at least 5 seconds when changing lanes on a freeway. This duration provides sufficient time for other drivers to notice your intention to change lanes, which is especially important on high-speed roadways like freeways where vehicle dynamics can be significantly faster. Signaling for an adequate amount of time enhances safety by allowing surrounding motorists to adjust their speed and position accordingly, thus reducing the risk of collisions. While a shorter signaling period might seem adequate, it does not account for the reaction time of other drivers, who may be focused on their own driving and will need additional time to see and respond to your signal. Therefore, the 5-second rule is generally recommended to ensure mutual awareness and a smoother transition between lanes.