C-31 Traffic Control Practice Questions - California CSLB C-31 Construction Zone Traffic Control Examination Exam

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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?

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

Correct Answer:

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

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