What is the primary function of the dash-mounted turn signal indicator lights in vehicles?

The primary function of the dash-mounted turn signal indicator lights in vehicles is to signal lane changes and turns. These lights provide a visual indication to the driver about the operation of the vehicle’s turn signals. When a driver activates the turn signal switch to indicate a left or right turn, the corresponding indicator light illuminates on the dashboard, reinforcing that the turn signal is engaged. This allows the driver to visually confirm that the signal is functioning correctly and enables them to safely communicate their intended movements to other road users, thereby enhancing overall road safety and awareness during lane changes and turns.