2023 Iowa Code 321.433 – Sirens, whistles, air horns, and bells prohibited

2022 Iowa Code 321.433 – Sirens, whistles, and bells prohibited

2020 Iowa Code 321.433 – Sirens, whistles, and bells prohibited

2018 Iowa Code 321.433 – Sirens, whistles, and bells prohibited

2016 Iowa Code 321.433 – Sirens, whistles, and bells prohibited

2014 Iowa Code 321.433 – Sirens, whistles, and bells prohibited.

2009 Iowa Code 321.433 – Sirens, whistles, and bells prohibited