Final answer:
4) Dashed white lines. Bicycle lanes are marked with dashed white lines to separate the bicycle lane from the adjacent vehicle lane.
Step-by-step explanation:
The correct answer is option 4) Dashed white lines. Bicycle lanes are marked with dashed white lines. These lines serve to separate the bicycle lane from the adjacent vehicle lane, indicating that the designated space is specifically for bicycles. Dashed lines allow for flexibility when entering and exiting the bicycle lane.