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SB 433

Revise right-of-way laws for roundabouts

2025 Regular Session Introduced by Theresa Manzella

Montana clarifies right-of-way rules at roundabouts to standardize traffic behavior and reduce collision risks at these increasingly common intersections.

Chapter Number Assigned
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Bill Summary · SB 433

Legislative bill overview

SB 433 revises Montana's right-of-way laws specifically for roundabout intersections, clarifying traffic rules and driver responsibilities at these traffic features. The bill has been signed into law as of May 5, 2025, and is now assigned a chapter number for codification into state statute.

Why is this important

Roundabouts operate under different traffic principles than traditional intersections, and unclear right-of-way rules can cause accidents and driver confusion. Clarifying these laws through legislation helps standardize driver behavior, reduces collisions, and provides law enforcement with clear standards for traffic enforcement at roundabouts.

Potential points of contention

  • Rural vs. urban implementation concerns: Montana has varying levels of roundabout infrastructure; rural drivers may have less experience navigating them, raising questions about whether statewide rules adequately address this disparity
  • Pedestrian and cyclist safety provisions: The bill's specific protections (or lack thereof) for vulnerable road users at roundabouts could be debated
  • Transition period for driver education: Without adequate public awareness campaigns, new right-of-way rules may initially increase confusion rather than improve safety during the adjustment period

Compiled from official sources — confirm details with the bill’s official record.

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