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Topic 4 · Section 23

Merging and Right-of-Way Courtesy

Sharing the road means cooperation, not competition. Here’s how to merge and yield courteously and safely:

  • 🚧 Zipper Merge: When two lanes reduce to one, take turns like teeth on a zipper — one car from each lane alternating.
    → Don’t try to speed ahead or block others. This keeps traffic flowing more smoothly.

  • 🛣️ Highway Courtesy: Already on the freeway? If safe, move one lane left to give space to on-ramp traffic trying to merge.

  • 🚗 If You’re Merging:

    • Use the acceleration lane to match traffic speed.
    • Signal early and find a safe gap.
    • Don’t stop at the end of the ramp unless traffic is jammed — that’s risky.
  • 🛑 4-Way Stops:

    • If two vehicles arrive at the same time:
      • The one going straight usually goes before a left turner.
      • A polite wave can help resolve confusion.
      • When in doubt, yield — better safe than sorry.
  • 🐢 Let Faster Cars Pass:

    • If 5 or more vehicles are behind you on a two-lane road, use a turnout or shoulder when safe to let them by (California law requires it).
  • 🛑 Left Lane Etiquette:

    • Don’t cruise in the passing lane (left lane) on highways.
    • Keep right unless actively passing slower traffic.

Driving cooperatively helps everyone get where they’re going more safely and with less stress.

Check you have it

179 practice questions cover defensive driving and safe driving practices, each explaining the reasoning behind its answer.

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Source: California Driver's Handbook (DL 600, rev. 6/2025). Edited by Fernando Aguilera. Aprobify is not affiliated with the California DMV.

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