Based on study data, the current 70-mph speed limit is appropriate for I-41.
Lower speed limits are often viewed as a quick fix to traffic safety, but this is not the case. Crashes are most often the result of other factors, such as inattentive driving, following too closely, and unsafe lane changes.
Typically, there is little change in speed patterns after posting a lower speed limit unless there are significant changes in the roadway environment and context. Drivers are much more influenced by physical changes to the roadway, its environment and driving conditions.
For a general overview of the engineering principles, policies and statutory guidance used by WisDOT in relation to speed limits, please visit: https://wisconsindot.gov/Pages/doing-bus/local-gov/traffic-ops/speed-management/default.aspx.
