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Minnesota driving lesson · Signs, Signals & Pavement Markings

Work zones, zipper merges and guide signs

A 3-minute lesson from the Minnesota 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 & Pavement Markings
Checkpoint questions
6
Source pages
4, 57, 58, 67, 68

Minnesota is said to have two seasons: winter and road construction. Work zones put people close to moving traffic and bring altered lanes and unpredictable equipment. Orange signs warn you; brown, blue and green signs guide you.

Know the rule

Orange signs with black letters mark construction and work zones: slow down. Drums, cones, tubes, flashing arrows and orange-and-white barriers keep you out of work areas; always follow people directing traffic with orange signs, flags or stop signs.

Handbook p. 67 ↗
Road work ahead
Road Work Ahead sign

Work zone rules

  • Be patient and expect delays, especially at peak travel times
  • Reduce speed and follow flag persons — disobeying one brings a violation and penalty
  • Obey reduced speed limits; if none is posted, obey the regular posted limit
  • Stay alert and adjust your lane position away from workers and equipment
  • Watch for distracted driving, zipper merges and altered lanes
Handbook p. 57 ↗
$300

Added fine for speeding in a work zone, on top of the regular ticket

Handbook p. 57 ↗
Work zone speed limit with fine
Work zone speed limit sign with $300 fine

Know the rule

A flagger symbol sign means a person with a flag is ahead — drive cautiously. A worker symbol sign means maintenance work is underway — slow down and move away from the workers.

Handbook p. 67 ↗

Zipper merge (late merge)

When a lane is closing and traffic is backing up, use both lanes up to the merge point, then take turns merging. Early merging causes longer backups and more crashes.

Handbook p. 57 ↗

Zipper merge procedure

  • At a lane-closed-ahead sign with traffic backing up, stay in your lane to the merge point
  • Take turns with other drivers to merge smoothly into the remaining lane
  • In heavy, slow traffic it's safer to stay in your lane until orderly turn-taking begins
Handbook p. 57 ↗

Why it works

  • Increases worker safety when a lane is closed
  • Reduces the speed difference between lanes, making lane changes safer
  • Cuts the overall length of backups by up to 40 percent
  • Reduces congestion at freeway interchanges, especially in metro areas
  • Feels fairer and reduces road rage
Handbook p. 58 ↗

Guide sign colors

Guide sign colors
ColorPoints you to
BrownHistoric sites, parks, other points of interest
BluePhones, gas, food, motels, hospitals, rest areas
GreenExits, city distances, interchanges, routes, bike routes
Handbook p. 68 ↗

Know the rule

Route signs show the type of roadway: interstate, U.S. highway, Minnesota highway or county road.

Handbook p. 68 ↗
Interstate route marker
Interstate route sign

Put it into practice

A sign warns that the right lane closes ahead, and traffic is backing up. Stay in the right lane up to the merge point, then alternate with drivers in the left lane — one from each lane, like a zipper.

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.

In a work zone, what additional fine applies for speeding, on top of the regular speeding ticket?
  1. $100
  2. $300
  3. $500
  4. $50

Answer: $300

Speeding in a work zone adds a $300 fine on top of the regular speeding ticket.

Handbook p. 57 ↗
What is the 'zipper merge' strategy designed to do?
  1. Encourage drivers to merge as early as possible
  2. Require drivers to stop completely before merging
  3. Use both lanes, then alternate at the merge
  4. Allow drivers to merge only from the right lane

Answer: Use both lanes, then alternate at the merge

The zipper merge keeps drivers in their lane until the merge point, then has them take turns, reducing backups.

Handbook p. 57 ↗
What color are construction and work zone warning signs, with black letters?
  1. Orange
  2. Yellow
  3. Red
  4. Blue

Answer: Orange

Construction and work zone signs use orange with black lettering.

Handbook p. 67 ↗
The zipper merge can reduce the overall length of traffic backups by up to 40 percent.
  1. True
  2. False

Answer: True

The handbook states the zipper merge can reduce backup length by up to 40 percent.

Handbook p. 58 ↗
You're driving through a work zone where no reduced speed limit is posted. What speed limit applies?
  1. 10 mph below the posted limit
  2. The regular posted limit
  3. 45 mph in every work zone
  4. 20 mph below the posted limit

Answer: The regular posted limit

If there are no reduced speed limit postings in a work zone, obey the posted speed limit; speeding there adds a $300 fine.

Handbook p. 57 ↗
What does an orange diamond sign showing a person holding a flag warn you about?
  1. Road maintenance workers are ahead
  2. A school crossing guard is ahead
  3. A person with a flag is ahead
  4. A detour begins ahead

Answer: A person with a flag is ahead

This construction sign indicates a person with a flag is ahead, so drive cautiously and follow their directions.

Handbook p. 67 ↗
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