Night and Low-Visibility Flagging Flashcards

What class of high-visibility apparel does California require flaggers to wear during nighttime operations?

Answer: Class 3

ANSI/ISEA 107 Class 3 garments provide the highest visibility at night due to increased background and retroreflective material requirements.

During nighttime flagging, the STOP/SLOW paddle should be:

Answer: Retroreflective or illuminated

Retroreflective or illuminated paddles ensure drivers can clearly see the flagger's signals in the dark.

The minimum illumination level required at a California nighttime flagger station is:

Answer: 1 foot-candle

California standards require a minimum of 1 foot-candle of illumination at nighttime flagger stations to ensure worker and driver safety.

When flagging at night, advance warning signs should feature:

Answer: High-intensity retroreflective sheeting

High-intensity retroreflective sheeting ensures advance warning signs are highly visible when illuminated by vehicle headlights at night.

At night, channelizing devices such as cones and drums must be:

Answer: Retroreflective or equipped with lights

Retroreflective or illuminated channelizing devices are required at night so drivers can clearly see the boundaries of the work zone.

If fog significantly reduces visibility during a flagging operation, the flagger should FIRST:

Answer: Alert the supervisor and consider slowing or stopping traffic

Reduced visibility is an immediate safety hazard requiring the flagger to notify the supervisor and take protective action for both workers and drivers.

For night flagging operations, the advance warning area may need to be:

Answer: Extended because drivers need more time to react

At night, reduced visibility means drivers have less time to see and react to warnings, requiring a longer advance warning area for safety.