6.2 Modern Roundabouts

6.2 Modern Roundabouts

[!NOTE] There is no roundabout statute. Washington does not have a section of chapter 46.61 RCW devoted to roundabouts. The legal duty at a roundabout entry is the ordinary yield-sign duty in RCW 46.61.190(3): slow to a speed reasonable for the conditions, stop if required for safety, and yield to traffic already in the circulatory roadway. Everything else - lane choice, signalling, truck aprons - is operating practice built on that duty plus the general lane rules. Be sceptical of any source that cites a specific "roundabout RCW."

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Why the design works

A modern roundabout removes the two crash types that dominate conventional intersections. There are no left turns across oncoming traffic and no crossing movements at ninety degrees, so the severe angle and head-on conflicts largely disappear. Entry deflection forces low speeds, which converts the remaining conflicts into low-energy sideswipes and rear-end contacts.

Teach the distinction, because a student who has driven an older circle may carry the wrong entry expectation.

Entering

1. Slow on approach and read the signs early. Destination-based guide signs appear before the yield line for a reason: the lane decision must be made before you arrive.
2. Choose the lane by destination, not by habit. In a typical two-lane roundabout the left lane serves left turns and the through movement, and the right lane serves right turns and the through movement, but the correct source is always the sign and the pavement arrows at that specific roundabout.
3. Look left. Circulating traffic approaches from the left. Yield to all lanes of it.
4. Do not stop when the circle is clear. Stopping unnecessarily at the yield line is the most common novice error and the main cause of rear-end contacts at roundabouts.
5. Watch the crosswalk. Roundabout crosswalks sit back from the yield line, on the splitter island approach. Pedestrian duties under RCW 46.61.235 apply there in full.

Circulating

• Stay in your lane. Lane changes inside the circulating roadway are unsupported by the geometry and by sight lines. If you entered in the wrong lane, complete a full circulation and re-enter correctly rather than changing lanes mid-circle.
• Do not stop inside the circle except to avoid a collision. A stopped vehicle in a circulating lane blocks every entry behind it.
• Yield to circulating traffic even when you are already inside, at multi-lane roundabouts where a vehicle beside you may be exiting across your path.

The truck apron

The raised, usually contrasting ring immediately outside the central island is a mountable truck apron. It is not a lane and it is not a shoulder. It exists so that the rear wheels of a long vehicle can track over it while the tractor stays in the circulating lane.

Two operating consequences:

• Passenger vehicles do not use it. Driving on the apron is a sign the entry speed was too high or the path was wrong.
• Give trucks the whole width. A long vehicle may occupy both circulating lanes through the turn. Never pull alongside a truck in a roundabout; the correct action is to hold back and let it complete the movement. Washington recognises this in statute: RCW 46.61.140(5) permits the operator of a commercial motor vehicle, with due regard for all other traffic, to "deviate from the lane in which the operator is driving to the extent necessary to approach and drive through a circular intersection."

Exiting

• Signal right before the exit you intend to take, after passing the exit before it. This is the signal that tells the driver waiting at that next entry whether they can go, and it is the single courtesy that keeps roundabout throughput high.
• Do not signal on entry. A left signal on entry is ambiguous and unhelpful.
• Check the exit crosswalk and the shoulder before leaving the circle; cyclists and pedestrians use the same splitter island.

Emergency vehicles

The safest practice, and the one Washington agencies teach, is do not stop inside a roundabout for an approaching emergency vehicle. Continue to your exit, then pull over clear of the circle. Stopping in the circulating roadway blocks every approach at once and leaves the emergency vehicle no path. If you have not yet entered, stop before the yield line and stay out.

Coaching a first roundabout

1. Walk the geometry first. Before the first live attempt, park nearby and have the student describe what they see: the yield line, the splitter island, the crosswalk position, the apron, the guide signs.
2. Pick a single-lane roundabout for attempt one. Multi-lane entries add a lane decision to a movement that is already novel.
3. Use commentary. Ask for narration on approach: "sign says left lane for my exit - checking left - two cars circulating - gap after the blue car - going." Narration exposes the decision, which is what you are teaching.
4. Rehearse the recovery. Tell the student in advance: if you end up in the wrong lane, go round again. Rehearsing the recovery removes the panic lane change.
5. Cover the brake at the yield line and again at the exit. Those are the two points where a novice most often misjudges.
6. Progress deliberately. Single-lane, then two-lane right turn, then two-lane through, then two-lane left. Each step adds exactly one new decision.

[!WARNING] Exam traps in this section

• There is no roundabout-specific RCW. The duty is the yield-sign duty in RCW 46.61.190(3).
• Yield to circulating traffic; do not stop when it is clear.
• Choose the lane before the yield line; do not change lanes inside.
• The truck apron is not a lane - hold back and give long vehicles the full width.
• Signal right before the exit, not on entry.
• Do not stop inside the circle for an emergency vehicle - exit, then pull over.