Practice question

A traffic control contractor is designing a merging taper to close a 12-foot lane on an urban street posted at 35 mph. What is the minimum taper length required?

  1. 420 feet, calculated using L = W × S for high-speed highway merging tapers.
  2. 245 feet, calculated using L = W × S² / 60 for speeds of 40 mph or less.
  3. 123 feet, calculated using L = W × S² / 120 for shifting tapers on streets.
  4. 82 feet, calculated using L = W × S² / 180 for shoulder tapers on streets.

Answer: B — 245 feet, calculated using L = W × S² / 60 for speeds of 40 mph or less.

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