What is an Arterial

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What is an Arterial?

• and why should you care?

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Have you seen a sign like this?

• What type of sign is this?
• How do you know?
• What information is it telling you?
• What should you be predicting?

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Objectives After todays lesson, you will be
able to

• Define the word arterial.
• Determine when a turn signal is required in
  traffic.
• Predict driving conditions and hazards when
  driving on arterial and non-arterial streets.
• Determine speed limits on city streets

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OK. Lets turn these objectives into questions
that you can answer as we go along. For example
Define the word arterial. Can be changed
into a question like
What is an arterial?
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Nowgo ahead and turn the other objectives into
questions you can answer.

• Define the word arterial. (What is an
  arterial?)
• Determine when a turn signal is required
• in traffic.
• 3. Predict driving conditions and hazards when
• driving on arterial and non-arterial streets.
• 4. Determine speed limits on city streets.

When you hear a sound effect, that is your cue
to write out an answer to your questions.
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What is an Arterial?and why should you care?

• Approaching this
• intersection, you ask
• your instructor Which
• way do you want me to
• go? Your instructor
• says, Stay on the
• arterial.
• So What do you do?

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Where did the word arterial come from?

• From the word artery

What is an artery?
A main blood vessel.
So, what do you think an arterial is?
A main road!
Are you ready for the complete definition?..
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What is an Arterial?An arterial is

• 1) a main road
• 2) with markings that separate lanes (paint
  stripes, turtles, etc.)
• 3) and always has controlled intersections

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When is a turn signal required in traffic?

• A turn signal is required anytime you leave your
  present lane in order to enter a new lane, road,
  driveway, parking lot, etc.
• Buthow do you know which way to signal?

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What driving conditions and hazards can you
predict on an arterial street?

• Speed limit?
• Types of intersections?
• Types of Traffic Controls?
• Traffic Flow?
• Hazards?

Arterial
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What driving conditions and hazards can you
predict on a non-arterial street?

• Speed limit?
• Types of intersections?
• Types of Traffic Controls?
• Traffic Flow?
• Hazards?

Non-Arterial
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Speed Limit Laws

• What is the speed limit on a city street in
  Washington State unless otherwise posted?
• 25 mph

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Speed Limits on Arterials

• What would the speed limit be on the street with
  the line markings, unless otherwise posted?

• 25 mph. Higher speeds are allowed on arterials
• only when posted, or by city ordinance!

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Seattle Arterials

• What is the speed limit on an arterial street
  in Seattle unless otherwise posted?
• 30 mph.
• Seattles ordinance code designates 30 mph as the
  arterial speed, unless otherwise posted.

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The city of Seattle has a special ordinance for
speed limits on arterials
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But, of course, the Basic Speed Law takes
precedence. Regardless of the speed limit

• You may never exceed a speed that is safe for the
  conditions.
• Conditions means
• Traffic, weather, road surface, traction,
  visibility,vehicle condition (tires,weight) road
  hazards, etc. etc. etc.

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For example, the speed limit on these two roads
is 25 mph.Butwould that be safe for the
conditions?
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• Is this an arterial?

• Remember, state law
• requires that ANY
• street with a speed limit
• greater than 25 mph
• MUST be designated
• as an arterial.

• Do you think this street
• is in Seattle?

• Does the speed limit
• change when you
• reach the school sign?

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A few more facts about arterials

• Arterials are also known as through streets.
• That means they have the right-of-way over the
  residential streets.
• Vehicles on the arterial may keep going
  through, while vehicles crossing from the
  residential streets must yield. (They have stop
  or yield signs)
• When two arterials cross at an intersection, they
  are usually controlled by a traffic light or
  4-way stop.

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What kind of a sign might the driver of the blue
car see as she approaches this intersection?
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Lets review our objectivesCan you answer these
questions?

• What is an arterial?
• When is a turn signal required in traffic?
• What driving conditions and hazards can we
  predict when driving on arterial and non-arterial
  roads?
• How can we determine speed limits on city streets?

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Developed byAlex HansenRegional Traffic Safety
CoordinatorESD 112 Vancouver, WA
With technical assistance provided by the ever-
talented and creative, Sara Larsen, Regional
Traffic Safety Transportation Support Staff.
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