---
type: "Bill"
title: "Traffic control: speed restrictions; procedure for establishing speed limits; modify. Amends sec. 628 of 1949 PA 300 (MCL 257.628)."
description: "Traffic control: speed restrictions; procedure for establishing speed limits; modify. Amends sec. 628 of 1949 PA 300 (MCL 257.628)."
jurisdiction: "us/states/mi"
legislature: "Michigan Legislature"
session: "2023-2024"
identifier: "HB 4012"
citation: "Michigan HB 4012 (2023-2024)"
classification: ["bill"]
subjects: ["State agencies (existing): transportation", "Traffic control: speed restrictions", "Traffic control: traffic regulation"]
status: "enacted"
primary_sponsors: ["Bradley Slagh"]
version_count: 5
action_count: 26
vote_count: 2
first_action: "2023-01-12"
last_action: "2024-04-09"
source: "openstates"
source_identifier: "ocd-bill/9d624ecf-655c-47d1-9acc-ea7c0d33df39"
source_url: "https://legislature.mi.gov/Bills/Bill?ObjectName=2023-HB-4012"
source_hash: "bcefddcc72f7def9248c9a9cf1a859c45eaef77ab4d85c075497b64729251267"
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-mi"]
---

# Michigan HB 4012 (2023-2024) — Traffic control: speed restrictions; procedure for establishing speed limits; modify. Amends sec. 628 of 1949 PA 300 (MCL 257.628).

## Version chain

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

1. **As Passed by the House** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billengrossed/House/pdf/2023-HEBH-4012.pdf)
2. **As Passed by the Senate** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billengrossed/House/pdf/2023-HEBS-4012.pdf)
3. **House Concurred Bill** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billconcurred/House/pdf/2023-HCB-4012.pdf)
4. **House Introduced Bill** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billintroduced/House/pdf/2023-HIB-4012.pdf)
5. **Public Act** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/publicact/pdf/2024-PA-0033.pdf)

## Votes

- PASSED; GIVEN IMMEDIATE EFFECT ROLL CALL # 60 YEAS 37 NAYS 0 EXCUSED 1 NOT VOTING 0 — **37–0** (pass) · upper
- passed; given immediate effect Roll Call # 355 Yeas 100 Nays 10 Excused 0 Not Voting 0 — **100–10** (pass) · lower

## Sponsors

- Bradley Slagh — primary (person)

## Timeline

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

- **2023-01-12** introduced by Representative Bradley Slagh `introduction`
- **2023-01-12** read a first time `reading-1`
- **2023-01-12** referred to Committee on Transportation, Mobility, and Infrastructure `referral-committee`
- **2023-01-17** bill electronically reproduced 01/12/2023
- **2023-06-13** reported with recommendation without amendment `committee-passage`
- **2023-06-13** referred to second reading
- **2023-10-12** read a second time `reading-2`
- **2023-10-12** placed on third reading
- **2023-10-12** placed on immediate passage
- **2023-10-12** read a third time `reading-3`
- **2023-10-12** passed; given immediate effect Roll Call # 355 Yeas 100 Nays 10 Excused 0 Not Voting 0 `passage`
- **2023-10-12** transmitted
- **2023-10-17** REFERRED TO COMMITTEE ON TRANSPORTATION AND INFRASTRUCTURE `referral-committee`
- **2024-02-21** REPORTED FAVORABLY WITHOUT AMENDMENT `committee-passage`
- **2024-02-21** REFERRED TO COMMITTEE OF THE WHOLE `referral-committee`
- **2024-03-14** REPORTED BY COMMITTEE OF THE WHOLE FAVORABLY WITHOUT AMENDMENT(S) `committee-passage`
- **2024-03-14** PLACED ON ORDER OF THIRD READING
- **2024-03-19** PASSED; GIVEN IMMEDIATE EFFECT ROLL CALL # 60 YEAS 37 NAYS 0 EXCUSED 1 NOT VOTING 0 `passage`
- **2024-03-19** INSERTED FULL TITLE
- **2024-03-19** returned from Senate without amendment with immediate effect and full title
- **2024-03-19** full title agreed to
- **2024-03-19** bill ordered enrolled
- **2024-04-09** presented to the Governor 03/27/2024 11:02 AM `executive-receipt`
- **2024-04-09** approved by the Governor 04/02/2024 01:16 PM `executive-signature`
- **2024-04-09** filed with Secretary of State 04/02/2024 02:10 PM
- **2024-04-09** assigned PA 33'24 with immediate effect

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/9d624ecf-655c-47d1-9acc-ea7c0d33df39`. Confidence: reported (aggregated from official Michigan legislature records).