Practice question

What is the minimum required merging taper length (L) for closing a 12-foot wide traffic lane on a California highway with a posted speed limit of 55 mph?

  1. 660 feet, calculated using L = W × S for speeds of 45 mph or greater.
  2. 302 feet, calculated using L = W × S² / 60 for low-speed urban streets.
  3. 440 feet, calculated using L = 0.67 × W × S for shifting tapers only.
  4. 220 feet, calculated using L = 0.33 × W × S for shoulder tapers only.

Answer: A — 660 feet, calculated using L = W × S for speeds of 45 mph or greater.

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