Versions of Iowa Code 321.307 - Following too closely on LawServer 2023 Iowa Code 321.307 – Following too closely 2022 Iowa Code 321.307 – Following too closely 2020 Iowa Code 321.307 – Following too closely 2018 Iowa Code 321.307 – Following too closely 2016 Iowa Code 321.307 – Following too closely 2014 Iowa Code 321.307 – Following too closely. 2009 Iowa Code 321.307 – Following too closely