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Difficulty: MediumSharing the Road with Large Vehicles

You are driving a passenger car on a multi-lane roadway and approaching a multi-lane roundabout alongside a large commercial truck. The truck signals its intention to enter the roundabout. What is the safest and legally correct procedure for you to follow?

  1. A
    Accelerate quickly to enter the roundabout before the truck so you do not get trapped beside its trailer.
  2. B
    Maintain your speed and drive directly alongside the truck, keeping strictly inside your lane.
  3. Yield and remain behind the truck, giving it extra space because large vehicles may need to occupy both lanes to complete the turn.Answer
  4. D
    Sound your horn continuously to warn the truck driver not to cross over the lane divider line into your lane.

Answer

Yield and remain behind the truck, giving it extra space because large vehicles may need to occupy both lanes to complete the turn.
Large commercial vehicles experience off-tracking when turning, meaning the rear wheels follow a tighter path than the front wheels. In multi-lane roundabouts, a long truck often needs to straddle both lanes or swing wide to avoid hitting the central island or curb. Yielding and remaining behind the truck allows it the clearance needed to navigate the roundabout safely.

Step-by-Step Solution

1
Identify the physical limitations of large commercial vehicles in curved road features.
Recognize that due to off-tracking, the rear wheels of a long truck trailer follow a shorter path than the front wheels, forcing the trailer into adjacent lanes during tight turns.
Large combination vehicles cannot stay strictly within a single narrow curved lane in multi-lane roundabouts.
2
Select the appropriate defensive driving maneuver when entering the roundabout.
Slow down, yield right-of-way space, and trail behind the large truck rather than driving alongside it.
Giving the truck space to use both lanes prevents squeeze-type crashes and keeps your passenger vehicle out of the truck's blind spots.

Key Concept

Off-Tracking and Multi-Lane Roundabout Navigation with Large Vehicles
Estimated Time:1m 0s
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Topics

Sharing the Road with Large Vehicles

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