---
type: "Bill"
title: "Generally revise motor vehicle traffic regulation laws"
description: "Generally revise motor vehicle traffic regulation laws"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2025"
identifier: "HB 43"
citation: "Montana HB 43 (2025)"
classification: ["bill"]
subjects: ["Motor Vehicles"]
status: "enacted"
primary_sponsors: ["Denise Baum"]
version_count: 42
action_count: 36
vote_count: 6
first_action: "2024-09-05T22:50:18+00:00"
last_action: "2025-03-27T21:04:43+00:00"
source: "openstates"
source_identifier: "ocd-bill/90cd37b9-cf04-4dbc-bb70-5da8d08e6877"
source_url: "https://bills.legmt.gov/#/laws/bill/2/LC0171?open_tab=sum"
source_hash: "49a12cda39a862c2c129d8b5fbf9ff50a024267b3c06ba196cf66f9ad66b2348"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 43 (2025) — Generally revise motor vehicle traffic regulation laws

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0043.001.001_Amendments-in-Context_final-full.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271216)
2. **HB0043_1(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=267411)
3. **HB0043_1(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272109)
4. **HB0043_1(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272110)
5. **HB0043_1(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272111)
6. **HB0043_1(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272112)
7. **HB0043_1(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275283)
8. **HB0043_1(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=276339)
9. **HB0043_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=267245)
10. **HB0043_2(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272114)
11. **HB0043_2(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=276471)
12. **HB0043_2(11).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=277217)
13. **HB0043_2(12).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287567)
14. **HB0043_2(13).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287568)
15. **HB0043_2(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272116)
16. **HB0043_2(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272118)
17. **HB0043_2(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272134)
18. **HB0043_2(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272138)
19. **HB0043_2(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272139)
20. **HB0043_2(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272146)
21. **HB0043_2(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=273228)
22. **HB0043_2(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275422)
23. **HB0043_2.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=272113)
24. **HB0043_3(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287572)
25. **HB0043_3(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287573)
26. **HB0043_3(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288076)
27. **HB0043_3(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288077)
28. **HB0043_3(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288080)
29. **HB0043_3(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288081)
30. **HB0043_3.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287570)
31. **HB0043_X(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=296039)
32. **HB0043_X(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=325632)
33. **HB0043_X(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=296040)
34. **HB0043_X(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=300430)
35. **HB0043_X(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=300431)
36. **HB0043_X(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=300432)
37. **HB0043_X(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=310614)
38. **HB0043_X(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=316570)
39. **HB0043_X(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=320171)
40. **HB0043_X(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=324088)
41. **HB0043_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295345)
42. **LC0171.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=265315)

## Votes

- do_pass_as_amended — **14–0** (pass) · lower
- Do Pass — **97–1** (pass) · lower
- Do Concur — **30–20** (pass) · upper
- be_concurred_in — **8–0** (pass) · upper
- Do Concur — **30–19** (pass) · upper
- Do Pass — **99–0** (pass) · lower

## Sponsors

- Denise Baum — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-09-05T22:50:18+00:00** (LC) Drafter Assigned
- **2024-10-01T17:52:05+00:00** (LC) Draft in Legal Review
- **2024-10-23T20:32:37+00:00** (LC) Draft in Edit
- **2024-10-28T16:26:23+00:00** (LC) Draft in Input/Proofing
- **2024-11-12T22:58:03+00:00** (LC) Draft in Final Drafter Review
- **2024-11-17T17:00:11+00:00** (LC) Draft in Assembly
- **2024-11-18T21:07:28+00:00** (LC) Draft Ready for Delivery
- **2024-12-09T16:08:26+00:00** (LC) Draft Delivered to Requester
- **2024-12-09T16:09:00+00:00** (H) Introduced
- **2024-12-20T22:11:50+00:00** (H) Referred to Committee - (H) Transportation `referral-committee`
- **2025-01-06T17:47:00+00:00** (H) First Reading `reading-1`
- **2025-01-11T00:15:02+00:00** (H) Hearing - (H) Transportation
- **2025-01-16T00:14:54+00:00** (H) Committee Executive Action--Bill Passed as Amended - (H) Transportation `committee-passage`
- **2025-01-16T20:18:56+00:00** (H) Committee Report--Bill Passed as Amended - (H) Transportation `committee-passage`
- **2025-01-20T20:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2025-01-20T20:33:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2025-01-21T20:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2025-01-21T21:23:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2025-01-21T21:48:51+00:00** (H) Transmitted to Senate
- **2025-01-22T20:36:57+00:00** (S) First Reading `reading-1`
- **2025-01-24T19:37:44+00:00** (S) Referred to Committee - (S) Highways and Transportation `referral-committee`
- **2025-01-25T01:29:17+00:00** (S) Hearing - (S) Highways and Transportation
- **2025-01-30T00:37:00+00:00** (S) Committee Executive Action--Bill Concurred - (S) Highways and Transportation
- **2025-01-30T21:53:00+00:00** (S) Committee Report--Bill Concurred - (S) Highways and Transportation
- **2025-02-20T23:28:53+00:00** (S) 2nd Reading Pass Consideration `reading-2`
- **2025-02-21T20:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2025-02-21T21:03:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2025-02-24T20:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2025-02-24T22:07:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2025-02-24T22:08:00+00:00** (H) Sent to Enrolling
- **2025-02-26T17:13:00+00:00** (H) Returned from Enrolling
- **2025-03-07T17:00:56+00:00** (H) Signed by Speaker `passage`
- **2025-03-18T13:15:18+00:00** (S) Signed by President `passage`
- **2025-03-18T16:15:15+00:00** (H) Transmitted to Governor `executive-receipt`
- **2025-03-27T19:57:36+00:00** (H) Signed by Governor `executive-signature`
- **2025-03-27T21:04:43+00:00** Chapter Number Assigned `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/90cd37b9-cf04-4dbc-bb70-5da8d08e6877`. Confidence: reported (aggregated from official Montana legislature records).