---
type: "Bill"
title: "A bill for an act permitting motor vehicles to stand unattended without first stopping the engine. (Formerly HSB 66.) Effective 7-1-17."
description: "A bill for an act permitting motor vehicles to stand unattended without first stopping the engine. (Formerly HSB 66.) Effective 7-1-17."
jurisdiction: "us/states/ia"
legislature: "Iowa General Assembly"
session: "2017-2018"
identifier: "HF 312"
citation: "Iowa HF 312 (2017-2018)"
classification: ["bill"]
subjects: ["engines", "motor vehicles", "stopped vehicles", "transportation", "unattended vehicles"]
status: "enacted"
primary_sponsors: []
version_count: 2
action_count: 14
vote_count: 2
first_action: "2017-02-14"
last_action: "2017-03-16"
source: "openstates"
source_identifier: "ocd-bill/a364b010-46c7-4397-b321-099011593d20"
source_url: "https://www.legis.iowa.gov/legislation/billTracking/billHistory?billName=HF 312&ga=87"
source_hash: "a22b76f9806f19b4af69d3a143d653076b2e33a1a96e39e97052f5b6cd6f15da"
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-ia"]
---

# Iowa HF 312 (2017-2018) — A bill for an act permitting motor vehicles to stand unattended without first stopping the engine. (Formerly HSB 66.) Effective 7-1-17.

## Version chain

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

1. **Introduced** (filed) — [source](https://www.legis.iowa.gov/docs/publications/LGI/87/attachments/HF312.html)
2. **Enrolled** (enrolled) — [source](https://www.legis.iowa.gov/docs/publications/LGE/87/attachments/HF312.html)

## Votes

- Shall the bill pass? — **49–0** (pass) · upper
- Shall the bill pass? — **98–1** (pass) · lower

## Timeline

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

- **2017-02-14** Introduced, placed on calendar. `introduction`
- **2017-02-22** Passed House, ayes 98, nays 1. `passage`
- **2017-03-02** Explanation of vote.
- **2017-02-22** Immediate message.
- **2017-02-23** Message from House.
- **2017-02-23** Read first time and attached to companion SF 235. `reading-1`
- **2017-03-08** Substituted for SF 235.
- **2017-03-08** Passed Senate, ayes 49, nays 0. `passage`
- **2017-03-09** Explanation of vote.
- **2017-03-08** Immediate message.
- **2017-03-08** Message from Senate.
- **2017-03-14** Reported correctly enrolled, signed by Speaker and President.
- **2017-03-14** Sent to Governor. `executive-receipt`
- **2017-03-16** Signed by Governor. `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/a364b010-46c7-4397-b321-099011593d20`. Confidence: reported (aggregated from official Iowa legislature records).