---
type: "Bill"
title: "Traffic control; traffic regulation; procedure for intersection traffic flow due to power failure; clarify. Amends sec. 649 of 1949 PA 300 (MCL 257.649)."
description: "Traffic control; traffic regulation; procedure for intersection traffic flow due to power failure; clarify. Amends sec. 649 of 1949 PA 300 (MCL 257.649)."
jurisdiction: "us/states/mi"
legislature: "Michigan Legislature"
session: "2017-2018"
identifier: "SB 521"
citation: "Michigan SB 521 (2017-2018)"
classification: ["bill"]
subjects: ["Traffic control: traffic regulation"]
status: "enacted"
primary_sponsors: []
version_count: 4
action_count: 29
vote_count: 2
first_action: "2017-09-06T04:00:00+00:00"
last_action: "2018-04-25T04:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/df0847c1-2f3c-43eb-9543-4153b8893dde"
source_url: "http://legislature.mi.gov/doc.aspx?2017-SB-0521"
source_hash: "22e27de99d9f62105e71c1d224b85455c9ba87aee35a35e5dad213983071153d"
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 SB 521 (2017-2018) — Traffic control; traffic regulation; procedure for intersection traffic flow due to power failure; clarify. Amends sec. 649 of 1949 PA 300 (MCL 257.649).

## 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](http://www.legislature.mi.gov/documents/2017-2018/billengrossed/Senate/htm/2017-SEBH-0521.htm)
2. **As Passed by the Senate** (committee substitute) — [source](http://www.legislature.mi.gov/documents/2017-2018/billengrossed/Senate/htm/2017-SEBS-0521.htm)
3. **Public Act** (committee substitute) — [source](http://www.legislature.mi.gov/documents/2017-2018/publicact/htm/2018-PA-0109.htm)
4. **Senate Introduced Bill** (committee substitute) — [source](http://www.legislature.mi.gov/documents/2017-2018/billintroduced/Senate/htm/2017-SIB-0521.htm)

## Votes

- passed; given immediate effect Roll Call # 215 Yeas 99 Nays 10 — **99–10** (pass) · lower
- PASSED ROLL CALL # 489 YEAS 36 NAYS 0 EXCUSED 2 NOT VOTING 0 — **36–0** (pass) · upper

## Sponsors

- 24 — cosponsor (person)
- Rick Jones — cosponsor (person)

## Timeline

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

- **2017-09-06T04:00:00+00:00** INTRODUCED BY SENATOR RICK JONES `introduction`
- **2017-09-06T04:00:00+00:00** REFERRED TO COMMITTEE ON TRANSPORTATION `referral-committee`
- **2017-12-05T05:00:00+00:00** REPORTED FAVORABLY WITH SUBSTITUTE S-1 `committee-passage`
- **2017-12-05T05:00:00+00:00** COMMITTEE RECOMMENDED IMMEDIATE EFFECT
- **2017-12-05T05:00:00+00:00** REFERRED TO COMMITTEE OF THE WHOLE WITH SUBSTITUTE S-1 `referral-committee`
- **2017-12-06T05:00:00+00:00** REPORTED BY COMMITTEE OF THE WHOLE FAVORABLY WITH SUBSTITUTE S-1 `committee-passage`
- **2017-12-06T05:00:00+00:00** SUBSTITUTE S-1 CONCURRED IN
- **2017-12-06T05:00:00+00:00** PLACED ON ORDER OF THIRD READING WITH SUBSTITUTE S-1
- **2017-12-06T05:00:00+00:00** RULES SUSPENDED
- **2017-12-06T05:00:00+00:00** PLACED ON IMMEDIATE PASSAGE
- **2017-12-06T05:00:00+00:00** PASSED ROLL CALL # 489 YEAS 36 NAYS 0 EXCUSED 2 NOT VOTING 0 `passage`
- **2017-12-06T05:00:00+00:00** received on 12/06/2017 `introduction`
- **2017-12-06T05:00:00+00:00** read a first time `reading-1`
- **2017-12-06T05:00:00+00:00** referred to Committee on Transportation and Infrastructure `referral-committee`
- **2018-03-13T04:00:00+00:00** reported with recommendation without amendment `committee-passage`
- **2018-03-13T04:00:00+00:00** referred to second reading
- **2018-04-10T04:00:00+00:00** read a second time `reading-2`
- **2018-04-10T04:00:00+00:00** placed on third reading
- **2018-04-11T04:00:00+00:00** read a third time `reading-3`
- **2018-04-11T04:00:00+00:00** passed; given immediate effect Roll Call # 215 Yeas 99 Nays 10 `passage`
- **2018-04-11T04:00:00+00:00** inserted full title
- **2018-04-11T04:00:00+00:00** returned to Senate
- **2018-04-12T04:00:00+00:00** GIVEN IMMEDIATE EFFECT
- **2018-04-12T04:00:00+00:00** FULL TITLE AGREED TO
- **2018-04-12T04:00:00+00:00** ORDERED ENROLLED
- **2018-04-18T04:00:00+00:00** PRESENTED TO GOVERNOR 4/17/2018 @ 3:16 PM `executive-receipt`
- **2018-04-25T04:00:00+00:00** APPROVED BY GOVERNOR 4/24/2018 @ 10:12 AM `executive-signature`
- **2018-04-25T04:00:00+00:00** FILED WITH SECRETARY OF STATE 4/24/2018 @ 10:48 AM
- **2018-04-25T04:00:00+00:00** ASSIGNED PA 0109'18 WITH IMMEDIATE EFFECT

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/df0847c1-2f3c-43eb-9543-4153b8893dde`. Confidence: reported (aggregated from official Michigan legislature records).