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Idaho driving lesson · Signs, Signals & Markings

Work zones, school patrols, and barricades

A 3-minute lesson from the Idaho course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Signs, Signals & Markings
Checkpoint questions
6
Source pages
46, 47, 48, 54

Work zones are hazardous for both workers and drivers: uneven pavement, narrow lanes, heavy equipment, and gravel. Crews may be just inches from traffic, day and night. Orange signs, cones, drums, barricades, and flashing arrow panels mark these areas.

Know the rule

In work zones, warning signs are orange and black; regulatory signs are black and white or red and white.

Handbook p. 46 ↗

Know the rule

Never go around or move barriers or signs to cross a road that is closed to traffic.

Handbook p. 46 ↗
Reverse curve (work zone lane shift)
Lane Shift sign

Know the rule

LANE SHIFT: all lanes shift as shown. Stay in your lane as it shifts slightly.

Handbook p. 46 ↗
Flagger ahead
Work zone sign: be prepared to stop

Know the rule

BE PREPARED TO STOP: slow down and be ready to stop for road work ahead.

Handbook p. 47 ↗
Slow-moving vehicle emblem
Slow-moving vehicle emblem

Slow Moving Vehicle sign

Marks a slow-moving vehicle you're approaching, mainly off-road vehicles like farm or construction equipment. Slow down and approach with caution.

Handbook p. 47 ↗

Road closure signs

Road closure signs
SignMeaning
Road ClosedNo entry except authorized personnel
Road Closed to Thru TrafficOpen only to local traffic stopping inside
Road Closed, Local Traffic OnlySame: no continuous trips through the zone
Handbook p. 47 ↗

Driving through work zones:

  • Slow down: speeding fines are increased where signs say so
  • Watch where you're going; workers are just inches from traffic
  • Don't follow too closely; leave plenty of space
  • Plan ahead and minimize distractions such as a cell phone and the stereo
  • Speeding, inattention, failing to yield, and bad lane changes all cause work zone crashes
Handbook p. 48 ↗

Know the rule

Obey any direction from a school safety patrol. Patrol members wear a badge, clothing, or insignia marked 'School Patrol' and display STOP or other signs where children cross.

Handbook p. 48 ↗

Know the rule

Barricades close lanes or roads. Red and white barricades are permanent; orange and white are temporary. Both colors give the same instructions, and some have flashing lights, especially at night.

Handbook p. 54 ↗

Reading barricade stripes

Reading barricade stripes
PatternMeaning
V-shaped patternRoad closed; you can go no further
Lines angle down to the leftPass the barricade on the left
Lines angle down to the rightPass the barricade on the right
Handbook p. 54 ↗
Road closed
Road-closed barricade with V-shaped stripes

Put it into practice

A 'Road Closed to Thru Traffic' sign blocks your shortcut, but you live on that street. You may drive in to reach your home. You may not use the work zone as a route through to the other side.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

'Road Closed' signs in a work zone mean the area:
  1. cannot be entered except by authorized personnel
  2. may be entered if no workers are visible
  3. requires a permit fee to enter
  4. is open to local traffic only

Answer: cannot be entered except by authorized personnel

Only authorized personnel may enter a fully closed work zone.

Handbook p. 47 ↗
'Road Closed to Thru Traffic' signs mean the work zone:
  1. allows any driver to pass through
  2. is open to local traffic only
  3. is completely closed to everyone
  4. is open only at night

Answer: is open to local traffic only

Local traffic with a reason to stop there may use the work zone.

Handbook p. 47 ↗
In a work zone with a lane-shift sign, you should:
  1. stop and wait for a flagger
  2. ignore the shift if traffic is light
  3. stay in your lane as it shifts slightly
  4. change to the leftmost lane immediately

Answer: stay in your lane as it shifts slightly

Follow the sign and stay in your lane through the shift.

Handbook p. 46 ↗
Fines for speeding in a work zone are:
  1. reduced during nighttime hours
  2. waived during active construction
  3. the same as elsewhere
  4. increased where signage indicates

Answer: increased where signage indicates

Work zone speeding fines are enhanced where posted.

Handbook p. 48 ↗
A barricade with lines angled down to the left means:
  1. traffic must stop and wait
  2. traffic must pass on the right side
  3. traffic must pass the barricade on the left side
  4. the road is completely closed

Answer: traffic must pass the barricade on the left side

Down-left angled lines direct traffic to pass on the left.

Handbook p. 54 ↗
A barricade with a V-shaped pattern means:
  1. traffic must merge right
  2. the lane narrows ahead
  3. traffic must merge left
  4. the road is closed

Answer: the road is closed

A V-shaped barricade signals a fully closed road.

Handbook p. 54 ↗
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