If another vehicle is in your blind spot while attempting a lane change, you should

• A. Proceed anyway if you think you can complete the maneuver safely.
• B. Signal and move into the lane regardless.
• C. Cancel the lane change and wait until it's safe.
• D. Honk to alert the other driver.

Answer: (C)

When you can’t see into the space you want to move into, you can’t be sure it’s free. A vehicle in your blind spot means there’s a chance you’ll collide if you try to change lanes. The safest choice is to cancel the lane change and wait until that space is clear before you proceed.

In practice, keep your current lane, recheck the area you want to move into—using both mirrors and a shoulder check—and only proceed when there’s no one in the blind spot. Signaling is good to communicate your intent, but it doesn’t guarantee safety if another vehicle is there. Honking isn’t a reliable substitute for making sure the lane is clear.