A
Prompt the driver of the front vehicle to give way.
B
To illuminate the vehicle and facilitate the driver's observation of the road environment.
✓
C
Signal other vehicles the location of your own vehicle.
✓
D
Reduce the impact of dark adaptation on driver's vision.
✓
ANSWER · B, C, D
Turning on the headlights before entering a tunnel illuminates the vehicle and reduces the impact of dark adaptation on the driver's vision, and also indicates the vehicle's position to others to avoid collisions.
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