---
type: "Bill"
title: "Vehicles: speed safety system pilot program."
description: "Existing law establishes a basic speed law that prohibits a person from driving a vehicle upon a highway at a speed greater than is reasonable or prudent given the weather, visibility, traffic, and highway conditions and in no event at a speed that endangers the safety of persons or property."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20232024"
identifier: "AB 645"
citation: "California AB 645 (20232024)"
classification: ["bill"]
subjects: ["Vehicles", "speed safety system pilot program"]
status: "enacted"
primary_sponsors: ["Friedman"]
version_count: 13
action_count: 38
vote_count: 10
first_action: "2023-02-09"
last_action: "2023-10-13"
source: "openstates"
source_identifier: "ocd-bill/f319ba9b-88a7-4cc2-b46c-db201e424fb6"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB645"
source_hash: "d23e30317207e1a028ecc374a058871f7cc65a235cf49ad4b6b8cec20c4087d9"
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-ca"]
---

# California AB 645 (20232024) — Vehicles: speed safety system pilot program.

Existing law establishes a basic speed law that prohibits a person from driving a vehicle upon a highway at a speed greater than is reasonable or prudent given the weather, visibility, traffic, and highway conditions and in no event at a speed that endangers the safety of persons or property.

## Version chain

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

1. **02/09/23 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64599INT)
2. **03/16/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64598AMD)
3. **03/30/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64597AMD)
4. **05/01/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64596AMD)
5. **06/14/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64595AMD)
6. **07/03/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64594AMD)
7. **07/14/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64593AMD)
8. **08/14/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64592AMD)
9. **08/22/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64591AMD)
10. **09/07/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64590AMD)
11. **10/13/23 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64588CHP)
12. **AB645** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB645)
13. **09/18/23 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB645&version=20230AB64589ENR)

## Votes

- Do pass — **4–2** (pass) · upper
- Placed on suspense file — **7–0** (pass) · upper
- Do pass. — **11–3** (pass) · lower
- Do pass as amended and be re-referred to the Committee on [Appropriations] — **8–1** (pass) · lower
- Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] — **10–1** (pass) · upper
- Do pass as amended, but first amend, and re-refer to the Committee on [Judiciary] — **10–5** (pass) · upper
- AB 645 Friedman Assembly Third Reading — **58–7** (pass) · lower
- Do pass and be re-referred to the Committee on [Privacy and Consumer Protection] — **12–0** (pass) · lower
- AB 645 Friedman Concurrence in Senate Amendments — **62–9** (pass) · lower
- 3rd Reading AB645 Friedman et al. By Wiener — **29–6** (pass) · upper

## Sponsors

- Friedman — primary (person)
- Berman — coauthor (person)
- Bonta — principal coauthor (person)
- Gipson — principal coauthor (person)
- Haney — coauthor (person)
- Lee — coauthor (person)
- McCarty — coauthor (person)
- Santiago — author (person)
- Stern — coauthor (person)
- Ting — author (person)
- Wicks — coauthor (person)
- Wiener — principal coauthor (person)

## Timeline

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

- **2023-02-09** Read first time. To print. `reading-1`
- **2023-02-10** From printer. May be heard in committee March 12.
- **2023-03-16** Referred to Coms. on TRANS. and P. & C.P. `referral-committee`
- **2023-03-16** From committee chair, with author's amendments: Amend, and re-refer to Com. on TRANS. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-03-20** Re-referred to Com. on TRANS. `referral-committee`
- **2023-03-30** From committee chair, with author's amendments: Amend, and re-refer to Com. on TRANS. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-04-03** Re-referred to Com. on TRANS. `referral-committee`
- **2023-04-18** Coauthors revised.
- **2023-04-18** From committee: Do pass and re-refer to Com. on P. & C.P. (Ayes 12. Noes 0.) (April 17). Re-referred to Com. on P. & C.P. `committee-passage, committee-passage-favorable, referral-committee`
- **2023-04-27** From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 8. Noes 1.) (April 25). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2023-05-01** Read second time and amended. `amendment-passage, reading-1, reading-2`
- **2023-05-02** Re-referred to Com. on APPR. `referral-committee`
- **2023-05-17** In committee: Set, first hearing. Referred to APPR. suspense file. `referral-committee`
- **2023-05-18** Joint Rule 62(a), file notice suspended. (Page 1580.)
- **2023-05-18** From committee: Do pass. (Ayes 11. Noes 3.) (May 18). `committee-passage, committee-passage-favorable`
- **2023-05-18** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-05-31** Read third time. Passed. Ordered to the Senate. (Ayes 58. Noes 7. Page 2064.) `passage, reading-1, reading-3`
- **2023-06-01** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2023-06-14** Referred to Coms. on TRANS. and JUD. `referral-committee`
- **2023-06-14** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on TRANS. `amendment-introduction, amendment-passage, reading-1, reading-2, referral-committee`
- **2023-06-29** From committee: Amend, and do pass as amended and re-refer to Com. on JUD. (Ayes 10. Noes 5.) (June 27). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2023-07-03** Read second time and amended. Re-referred to Com. on JUD. `amendment-passage, reading-1, reading-2, referral-committee`
- **2023-07-14** From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 10. Noes 1.) (July 11). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2023-07-14** Read second time and amended. Re-referred to Com. on APPR. `amendment-passage, reading-1, reading-2, referral-committee`
- **2023-08-14** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on APPR. `amendment-introduction, amendment-passage, reading-1, reading-2, referral-committee`
- **2023-08-21** In committee: Hearing postponed by committee.
- **2023-08-22** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on APPR. `amendment-introduction, amendment-passage, reading-1, reading-2, referral-committee`
- **2023-08-28** In committee: Referred to APPR suspense file. `referral-committee`
- **2023-09-01** From committee: Do pass. (Ayes 4. Noes 2.) (September 1). `committee-passage, committee-passage-favorable`
- **2023-09-05** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-09-07** Read third time and amended. Ordered to second reading. `amendment-passage, reading-1, reading-3`
- **2023-09-11** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-09-12** Read third time. Passed. Ordered to the Assembly. (Ayes 29. Noes 6. Page 2628.). `passage, reading-1, reading-3`
- **2023-09-12** In Assembly. Concurrence in Senate amendments pending.
- **2023-09-13** Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 62. Noes 9. Page 3361.). `amendment-passage, committee-passage-favorable`
- **2023-09-20** Enrolled and presented to the Governor at 4 p.m.
- **2023-10-13** Approved by the Governor. `executive-signature`
- **2023-10-13** Chaptered by Secretary of State - Chapter 808, Statutes of 2023. `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/f319ba9b-88a7-4cc2-b46c-db201e424fb6`. Confidence: reported (aggregated from official California legislature records).