Iowa Code § 321.361: Additional parking regulations.

1. Except as otherwise provided in this section every vehicle stopped or parked upon a roadway where there are adjacent curbs shall be so stopped or parked with the right-hand wheels of such vehicle parallel to and within eighteen inches of the right-hand curb.

2. Local authorities may by ordinance permit parking of vehicles with the left-hand wheels adjacent to and within eighteen inches of the left-hand curb of a one-way roadway.

3. Local authorities may by ordinance permit angle or center parking on any roadway under their jurisdiction.