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Idaho driving lesson · Signs, Signals & Markings

Regulatory and guide signs

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
44, 45, 53

Traffic control devices are signals, signs, and pavement markings; officers, highway personnel, and school crossing guards can direct traffic too, and you must obey them. Learn signs by color and shape so you can read them before you can read the words.

Know the rule

Regulatory signs tell you what you must do. They are generally black and white, although some are red and white.

Handbook p. 44 ↗
Stop
Stop sign

Know the rule

At a STOP sign, stop at the marked stop line. With no stop line, stop before the crosswalk on the near side. With no crosswalk, stop where you can see approaching traffic before entering the intersecting highway.

Handbook p. 44 ↗
Yield
Yield sign

Know the rule

At a YIELD sign, slow down and yield to vehicles and pedestrians in the intersection or on the highway you're entering; stop if necessary. If pedestrians are in or about to enter the crosswalk, stop until they have crossed.

Handbook p. 44 ↗
Do not enter
Do Not Enter sign

Know the rule

DO NOT ENTER: you may not enter that section of highway from the direction you're traveling.

Handbook p. 45 ↗
Speed limit signs (composite)
Speed limit signs, including truck, night, and minimum speeds

Know the rule

A SPEED LIMIT sign shows the maximum speed for that section of road under ideal driving conditions.

Handbook p. 45 ↗
Keep right
Keep Right of Island sign

Know the rule

KEEP RIGHT OF ISLAND: the road ahead is divided; stay on the right side of the island or barrier.

Handbook p. 45 ↗
No left turn / No right turn
Turn prohibition signs: No Left Turn, No Right Turn
Turn prohibition and lane control signs
No U-Turn and lane control signs: Straight Only, Left Turn Only, Right Turn Only

Guide sign colors

Guide sign colors
ColorsMeaning
White on greenDirections and distances
White on blueMotorist services
White on brownCultural, historical, or scenic points of interest
Handbook p. 53 ↗
Guide and service signs (composite)
Guide signs: blue services, green directions, brown recreation

Put it into practice

You reach a stop sign with no stop line and no crosswalk, and a hedge blocks your view. Don't stop back at the hedge and go blind: stop at the point nearest the cross street where you can see approaching traffic, then proceed when clear.

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.

A 'Do Not Enter' sign means:
  1. you must stop before entering the road
  2. only trucks may not enter the road
  3. you may not enter that road from your direction
  4. the road ahead is closed for repairs

Answer: you may not enter that road from your direction

A Do Not Enter sign means you may not enter that section of highway from the direction you are traveling.

Handbook p. 45 ↗
Regulatory signs are generally what colors?
  1. Yellow and green
  2. Black and white, or red and white
  3. Blue and white
  4. Orange and black

Answer: Black and white, or red and white

Regulatory signs are mostly black-and-white, with some red-and-white.

Handbook p. 44 ↗
A guide sign that is white lettering on green indicates:
  1. work zone warnings
  2. scenic or historical points
  3. directions and distances
  4. motorist services

Answer: directions and distances

Green guide signs give directions and distances.

Handbook p. 53 ↗
A guide sign that is white lettering on blue indicates:
  1. historical points of interest
  2. directional and distance information
  3. work zone closures
  4. motorist services

Answer: motorist services

Blue guide signs point out motorist services like gas and food.

Handbook p. 53 ↗
A guide sign that is white lettering on brown indicates:
  1. historical or scenic sites
  2. directional and distance information
  3. work zone closures
  4. motorist services

Answer: historical or scenic sites

Brown guide signs mark cultural, historical, or scenic sites.

Handbook p. 53 ↗
A 'Keep Right of Island' sign means:
  1. no left turns are allowed ahead
  2. stay on the right side of the island
  3. the road narrows ahead
  4. the right lane ends ahead

Answer: stay on the right side of the island

The road ahead is divided; stay on the right side of the island or barrier.

Handbook p. 45 ↗
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