People mix this up with failure to signal, but they are not the same thing. A failure to signal means a driver changed direction without using a turn signal. An improper lane change is broader: moving from one lane to another when it is not reasonably safe to do so. A driver can signal and still make an improper lane change. They can also change lanes safely but forget the signal and get cited for that instead. The real issue is whether the move was unsafe, careless, or forced another driver to brake, swerve, or crash.

Practically, this matters because lane-change wrecks are common and ugly, especially around heavy truck traffic and tight merges. On Kentucky roads, that can mean tourist traffic on rural two-lane routes or overnight freight traffic near Louisville's airport. Kentucky law, including KRS 189.340, requires that a driver not move right or left on a roadway unless the movement can be made with reasonable safety, and it also requires an appropriate signal.

For an injury claim, an improper lane change can be strong evidence of negligence, but it does not end the argument. Kentucky follows pure comparative fault under KRS 411.182, so even a badly positioned driver may still recover damages, reduced by their share of fault. A citation helps, but the real fight is over what the lane change actually caused.