Versions of Iowa Code 321.453 - Exceptions on LawServer 2023 Iowa Code 321.453 – Exceptions 2022 Iowa Code 321.453 – Exceptions 2020 Iowa Code 321.453 – Exceptions 2018 Iowa Code 321.453 – Exceptions 2016 Iowa Code 321.453 – Exceptions 2014 Iowa Code 321.453 – Exceptions. 2009 Iowa Code 321.453 – Exceptions