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SF643 • 2026

A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

Budget
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
COMMITTEE ON APPROPRIATIONS
Last action
2025-05-12
Official status
Withdrawn. S.J. 962 .
Effective date
Not listed

Plain English Breakdown

Using official source text because the generated explanation was unavailable or could not be confirmed against the official bill text.

A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

What This Bill Does

  • A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

Limits and Unknowns

  • This entry is temporarily using official source text because the generated explanation could not be confirmed against the official bill text during the last sync.

Bill History

  1. 2025-05-12 Iowa Legislature

    Withdrawn. S.J. 962 .

  2. 2025-05-12 Iowa Legislature

    HF 1025 substituted. S.J. 961 .

  3. 2025-04-30 Iowa Legislature

    Attached to HF 1025 . S.J. 934 .

  4. 2025-04-30 Iowa Legislature

    Committee report, approving bill. S.J. 933 .

  5. 2025-04-30 Iowa Legislature

    Introduced, placed on Appropriations calendar. S.J. 932 .

Official Summary Text

A bill for an act relating to certain state highways not designated as part of the interstate road system, including the operation of implements of husbandry on such highways, and including applicability provisions.(Formerly SF 568 , SSB 1187 .)

Current Bill Text

Read the full stored bill text
Senate

File

643

-

Introduced

SENATE

FILE

643

BY

COMMITTEE

ON

APPROPRIATIONS

(SUCCESSOR

TO

SF

568)

(SUCCESSOR

TO

SSB

1187)

(COMPANION

TO

HF

1025

BY

COMMITTEE

ON

APPROPRIATIONS)

A

BILL

FOR

An

Act

relating

to

certain

state

highways

not

designated

as

1

part

of

the

interstate

road

system,

including

the

operation

2

of

implements

of

husbandry

on

such

highways,

and

including

3

applicability

provisions.

4

BE

IT

ENACTED

BY

THE

GENERAL

ASSEMBLY

OF

THE

STATE

OF

IOWA:

5

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S.F.

643

Section

1.

NEW

SECTION

.

314.16A

Interstate

road

designation

1

——

prohibition.

2

The

department

of

transportation

and

the

state

3

transportation

commission

shall

not

pursue

an

interstate

4

road

designation

for

the

segment

of

highway

that

is

a

5

controlled-access

facility,

as

defined

in

section

306A.2,

6

designated

as

state

highway

5

and

United

States

highway

65,

7

including

where

the

highway

designations

overlap,

between

8

interstate

35

and

interstate

80,

unless

the

United

States

9

government

provides

an

exemption

to

federal

regulations

10

regarding

vehicle

weight

and

size

on

that

segment.

The

federal

11

exemption

must

authorize

any

vehicle

that

is

not

prohibited

12

from

being

operated

on

the

segment

prior

to

the

date

of

13

designation

as

an

interstate

road

to

continue

to

be

operated

on

14

the

segment

after

designation

as

an

interstate

road.

15

Sec.

2.

Section

321.285,

subsection

5,

paragraph

e,

Code

16

2025,

is

amended

to

read

as

follows:

17

e.

(1)

Any

kind

of

A

vehicle,

device,

implement,

or

18

conveyance

incapable

of

attaining

and

maintaining

a

speed

19

of

forty

miles

per

hour

shall

be

prohibited

from

using

the

20

interstate

road

system.

21

(2)

This

paragraph

does

not

apply

to

an

implement

of

22

husbandry

that

a

person

is

authorized

to

operate

on

the

segment

23

of

United

States

highway

65,

and

state

highway

5,

including

24

where

the

highway

designations

overlap,

between

the

highway’s

25

intersection

with

United

States

highway

6

and

the

highway’s

26

intersection

with

United

States

highway

69,

or

farther

west

27

if

authorized

by

the

department,

prior

to

the

date

that

28

segment

of

highway

is

designated

a

part

of

the

interstate

29

road

system,

if

the

segment

of

highway

is

designated

a

part

30

of

the

interstate

road

system.

The

department

may

authorize

31

an

implement

of

husbandry

to

be

operated

on

a

segment

of

the

32

highway

described

above

farther

west

beyond

the

intersection

33

with

United

States

highway

69.

This

subparagraph

is

repealed

34

on

the

date

an

alternative

route

for

implements

of

husbandry

is

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643

developed,

deemed

suitable

by

the

department

of

transportation

1

in

consultation

with

the

department

of

agriculture

and

land

2

stewardship,

and

opened

for

traffic

to

bypass

the

segment

of

3

the

interstate

road

system

described

in

this

subparagraph.

The

4

department

of

transportation

shall

notify

the

Iowa

Code

editor

5

on

that

date.

6

Sec.

3.

ALTERNATIVE

HIGHWAY

STUDY.

The

department

of

7

transportation

shall

collaborate

with

the

Des

Moines

area

8

metropolitan

planning

organization

as

the

organization

conducts

9

an

alternative

highway

study

to

develop

and

implement

an

10

accessible

highway

route

suitable

for

implements

of

husbandry

11

to

be

operated

alongside,

but

not

directly

on,

the

segment

of

12

United

States

highway

65,

and

state

highway

5,

including

where

13

the

highway

designations

overlap,

between

United

States

highway

14

6

and

United

States

highway

69.

15

Sec.

4.

APPLICABILITY.

This

Act

applies

to

the

segment

16

of

the

highway

known

as

United

States

highway

65,

and

state

17

highway

5,

including

where

the

highway

designations

overlap,

18

described

in

this

Act

on

the

effective

date

of

this

Act,

19

and

shall

apply

to

that

segment

of

the

highway

thereafter

20

regardless

of

whether

the

highway’s

designation

as

United

21

States

highway

65,

or

state

highway

5,

including

where

the

22

highway

designations

overlap,

is

subsequently

changed

by

the

23

state

transportation

commission,

department

of

transportation,

24

or

the

government

of

the

United

States.

25

EXPLANATION

26

The

inclusion

of

this

explanation

does

not

constitute

agreement

with

27

the

explanation’s

substance

by

the

members

of

the

general

assembly.

28

Under

current

law,

any

kind

of

vehicle,

implement,

or

29

conveyance

incapable

of

attaining

and

maintaining

a

speed

of

40

30

miles

per

hour

(MPH)

is

prohibited

from

using

the

interstate

31

road

system.

32

This

bill

provides

a

conditional

exception

to

that

33

prohibition.

If

an

implement

of

husbandry

may

be

operated

34

on

the

segment

of

the

highway

known

as

U.S.

highway

65,

and

35

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S.F.

643

state

highway

5,

including

where

the

highway

designations

1

overlap

(segment),

between

the

highway’s

intersection

with

U.S.

2

highway

6

and

the

highway’s

intersection

with

U.S.

highway

69,

3

prior

to

the

date

the

segment

becomes

part

of

the

interstate

4

road

system,

then

the

implement

of

husbandry

may

continue

to

5

be

operated

on

that

segment

until

an

alternative

route

for

6

implements

of

husbandry

is

made

available.

The

department

of

7

transportation

(DOT)

may

authorize

an

implement

of

husbandry

to

8

be

operated

on

the

segment

farther

west

beyond

the

intersection

9

with

U.S.

highway

69.

10

Under

current

law,

an

“implement

of

husbandry”

means

a

11

vehicle

or

special

mobile

equipment

manufactured,

designed,

12

or

reconstructed

for

agricultural

purposes

and,

except

13

for

incidental

uses,

is

exclusively

used

in

the

conduct

of

14

agricultural

operations.

To

be

considered

an

implement

of

15

husbandry,

a

self-propelled

qualifying

vehicle

must

be

operated

16

at

speeds

of

35

MPH

or

less.

17

The

bill

prohibits

the

DOT

and

the

state

transportation

18

commission

from

pursuing

an

interstate

road

designation

for

19

the

segment

extending

between

the

segment’s

intersections

with

20

interstate

35

and

interstate

80

unless

the

U.S.

government

21

provides

an

exemption

from

federal

regulations

regarding

22

vehicle

weight

and

size

on

that

segment,

as

described

in

the

23

bill.

24

The

bill

requires

the

DOT

to

collaborate

with

the

Des

Moines

25

area

metropolitan

planning

organization

as

the

organization

26

conducts

an

alternative

highway

study

to

develop

and

implement

27

an

accessible

alternative

highway

route

suitable

for

implements

28

of

husbandry.

29

The

bill

applies

to

the

segment

on

the

effective

date

of

the

30

bill,

and

will

continue

to

apply

to

the

segment

regardless

of

31

whether

the

highway’s

designation

is

subsequently

changed.

32

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