A traffic-control taper uses a project rule of 10 feet of taper per 1 mph of speed. At 25 mph, what taper length is required?
Correct Answer
C) 250 feet.
Using the project rule, 25 mph times 10 feet per mph equals 250 feet.
Why This Is the Correct Answer
Using the project rule, 25 mph times 10 feet per mph equals 250 feet.
Why the Other Options Are Wrong
Option A: 150 feet.
150 feet. is below the supported result for traffic control calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 200 feet.
200 feet. is below the supported result for traffic control calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option D: 300 feet.
300 feet. is above the supported result for traffic control calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Traffic cart for Laying Out: mph first, times second, whole the controlling choice last.
Reference Hint
Study anchor (closed-book): memorize Traffic control calculation from Cal/OSHA Title 8 Construction Safety Orders; CSLB B General Building. / Cal/OSHA Title 8 traffic control and work zone protection concepts; know the rule or calculation trigger without relying on exam-room lookup.
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