CA Flagger Setup and Closure 5

Question 1

A flagger is setting up a work zone on a road with a 35 mph posted speed.
Using the taper length formula for speeds under 45 mph (L = WS²/60), what is the minimum taper length if the lane width is 12 feet?

Accepted Answer

245 feet

Answer

140 feet

Answer

420 feet

Answer

720 feet

Question 2

During a long-term lane closure lasting several days, what additional setup element is often required that is not needed for short-duration operations?

Accepted Answer

Positive protection barriers such as concrete or water-filled barriers

Answer

A flagger at every cone

Answer

Removal of all advance warning signs at night

Answer

A separate lane solely for emergency vehicles

Question 3

When closing a shoulder for work rather than a travel lane, which statement about advance warning requirements is correct?

Accepted Answer

Advance warning signs are still required, though spacing may be reduced

Answer

No advance warning is required for shoulder closures

Answer

Only cones are needed — no signs

Answer

The same full lane-closure setup is always required

Question 4

At the end of the work day, the crew will resume work the next morning. Which devices may remain in place overnight according to California temporary traffic control standards?

Accepted Answer

Only devices that are weighted or anchored and equipped with retroreflective materials or lights

Answer

All devices, including those without retroreflectivity

Answer

No devices — everything must be removed nightly

Answer

Only advance warning signs, never cones or drums

Question 5

A supervisor asks a flagger to close a lane without the proper number of advance warning signs because they are unavailable. What should the flagger do?

Accepted Answer

Refuse and report the situation to the appropriate authority, as the setup does not meet safety requirements

Answer

Comply immediately — the supervisor's order overrides safety standards

Answer

Set up the zone and place extra cones to compensate

Answer

Begin the closure and order the signs while work proceeds

Question 6

What is the purpose of a shadow vehicle (truck) positioned with its arrow board during mobile or slow-moving work zone operations?

Accepted Answer

To act as a moving buffer that absorbs impact and directs traffic away from workers

Answer

To carry extra cones for the crew

Answer

To provide a shaded rest area for flaggers

Answer

To block the entire road while workers move equipment

Question 7

After a temporary lane closure is completely removed, what is the final responsibility of the flagger before leaving the site?

Accepted Answer

Verify the roadway is restored to its original condition with no devices or hazards remaining

Answer

File a written report with CalTrans

Answer

Notify the local police department that work is complete

Answer

Remove all high-visibility vests from the area