Versions of Iowa Code 411.16 - Hours of service on LawServer 2023 Iowa Code 411.16 – Hours of service 2022 Iowa Code 411.16 – Hours of service 2020 Iowa Code 411.16 – Hours of service 2018 Iowa Code 411.16 – Hours of service 2016 Iowa Code 411.16 – Hours of service 2014 Iowa Code 411.16 – Hours of service. 2009 Iowa Code 411.16 – Hours of service