# Montana SB 433: Revise right-of-way laws for roundabouts

Montana SB 433, Revise right-of-way laws for roundabouts, is a 69th Legislature, Regular Session (2025) Senate bill sponsored by Theresa Manzella (Republican); status signed, last action 2025-05-08 (Chapter Number Assigned) (as of 2026-10-12).

- Canonical: https://policyrisk.com/state-bill/MT-SB433-2025
- As of: 2026-10-12
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Montana SB 433
- State: Montana
- Session: 69th Legislature, Regular Session (2025)
- Title: Revise right-of-way laws for roundabouts
- Status: signed
- Chamber: Senate
- Introduced: 2025-02-24
- Last action: 2025-05-08, Chapter Number Assigned
- Sponsor: Theresa Manzella (Republican)
- Cosponsors: 2
- Subjects: Highways and Roads
- Touches household money: no
- Roll calls: 5 (344 yes, 4 no in all)
- Economic provisions PRIA read: 2

## Summary

No summary available.

## Bill overview: provisions PRIA read

- Clearer rules for one-way roads: mixed, low. The transportation department or a local authority can mark roads, parts of roads, or lanes as one-way. They must post official signs showing the direction. On a posted one-way road, you must drive only in the shown direction.
- Roundabout right-of-way and towing rules: mixed, low. The law sets clear roundabout rules. When you go around a rotary island or roundabout, you must keep to the right of the island or center. Vehicles already in the circle have the right-of-way, and approaching drivers must yield. On multi-lane approaches, a towing vehicle may leave its lane to enter…

## Sponsors and cosponsors

- Sponsor: Theresa Manzella (Republican), Senate
- Cosponsor: Kenneth Bogner (Republican), Senate
- Cosponsor: Neil Duram (Republican), House

## Roll call votes

| Date | Chamber | Motion | Result | Yes | No | Other |
| --- | --- | --- | --- | --- | --- | --- |
| 2025-04-11 | House | Do Concur | pass | 98 | 1 |   |
| 2025-04-10 | House | Do Concur | pass | 100 | 0 |   |
| 2025-03-06 | Senate | Do Pass | pass | 48 | 1 |   |
| 2025-03-05 | Senate | Do Pass As Amended | pass | 48 | 2 |   |
| 2025-03-05 | Senate | AMD-SB0433.001.001 Manzella D/PASS | pass | 50 | 0 |   |

## Actions (28)

- 2025-05-08: Chapter Number Assigned (Senate)
- 2025-05-05: Signed by Governor (Senate)
- 2025-04-25: Transmitted to Governor (Senate)
- 2025-04-25: Signed by Speaker (House)
- 2025-04-21: Signed by President (Senate)
- 2025-04-13: Returned from Enrolling (Senate)
- 2025-04-11: Sent to Enrolling (Senate)
- 2025-04-11: 3rd Reading (House)
- 2025-04-10: 2nd Reading (House)
- 2025-03-29: Committee Report (House)
- 2025-03-28: Committee Executive Action (House)
- 2025-03-18: Hearing (House)
- 2025-03-17: 1st Reading (House)
- 2025-03-17: Referred to Committee (House)
- 2025-03-07: Transmitted to House (Senate)
- 2025-03-06: 3rd Reading (Senate)
- 2025-03-05: 2nd Reading (Senate)
- 2025-03-05: 2nd Reading Motion to Amend (Senate)
- 2025-03-03: Fiscal Note Printed (Senate)
- 2025-03-03: Fiscal Note Unsigned (Senate)
- 2025-03-03: Fiscal Note Received (Senate)
- 2025-03-01: Committee Report (Senate)
- 2025-02-28: Committee Executive Action (Senate)
- 2025-02-25: Fiscal Note Requested (Senate)
- 2025-02-25: Hearing (Senate)
- 2025-02-24: Referred to Committee (Senate)
- 2025-02-24: 1st Reading (Senate)
- 2025-02-24: Introduced (Senate)

## Bill text

- Enrolled, 2025-04-12: [PDF](https://docs.legmt.gov/download-ticket?ticketId=5910b40a-708e-4bfb-84e1-74afba4699ad)
- As Amended (Version 2), 2025-03-05: [PDF](https://docs.legmt.gov/download-ticket?ticketId=8677540f-1d13-4e57-b083-962f49dbaab6)
- Introduced, 2025-02-24: [PDF](https://docs.legmt.gov/download-ticket?ticketId=b6ba608b-3889-4419-a671-1a72c3b8398a)

## Related bills

- SB 437: Revise definition of sex in Montana law (signed)
- HB 831: Increase elderly homeowner and renter income tax credit (vetoed)
- HB 628: Revise early literacy targeted intervention laws (vetoed)
- SB 410: Provide for Montana genomic security act (vetoed)
- SB 424: Revising the disabled veteran property tax assistance program (vetoed)
- SB 422: Generally revise laws relating to insurance coverage relating to cancer (vetoed)

## Sources
- [Enrolled (PDF)](https://docs.legmt.gov/download-ticket?ticketId=5910b40a-708e-4bfb-84e1-74afba4699ad)
- [As Amended (Version 2) (PDF)](https://docs.legmt.gov/download-ticket?ticketId=8677540f-1d13-4e57-b083-962f49dbaab6)
- [Introduced (PDF)](https://docs.legmt.gov/download-ticket?ticketId=b6ba608b-3889-4419-a671-1a72c3b8398a)

## Related
- [SB 437: Revise definition of sex in Montana law](https://policyrisk.com/state-bill/MT-SB437-2025)
- [HB 831: Increase elderly homeowner and renter income tax credit](https://policyrisk.com/state-bill/MT-HB831-2025)
- [HB 628: Revise early literacy targeted intervention laws](https://policyrisk.com/state-bill/MT-HB628-2025)
- [SB 410: Provide for Montana genomic security act](https://policyrisk.com/state-bill/MT-SB410-2025)
- [SB 424: Revising the disabled veteran property tax assistance program](https://policyrisk.com/state-bill/MT-SB424-2025)
- [SB 422: Generally revise laws relating to insurance coverage relating to cancer](https://policyrisk.com/state-bill/MT-SB422-2025)
- [Montana bills](https://policyrisk.com/states/montana/bills)
- [Montana state hub](https://policyrisk.com/states/montana)
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Source: PRIA, https://policyrisk.com/state-bill/MT-SB433-2025 (as of 2026-10-12).