Speed Limits: Frequently Asked Questions

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State Statute 349.11 requires an engineering and traffic investigation (engineering study) to establish speed limits on public roadways in Wisconsin.

Local Roadways (e.g., Badger Street, County Highway A)
Local units of government are required to follow the Wisconsin Manual on Uniform Traffic Control (WMUTCD) per ss 349.065. Section 1C.02 of the WMUTCD defines the requirements of an engineering and traffic investigation (engineering study). Section 1D.03 of the WMUTCD defines the requirements of who can complete an engineering and traffic investigation.  It is expected that the performance of engineering studies and exercising engineering judgment are presumed to include the use of engineering technicians or other qualified personnel who are trained in the principlesand practices of traffic engineering studies or traffic control devices, and whose normal duties ​include performing engineering studies and designing, placing, operating and maintaining traffic control devices within a jurisdiction.​

Per Section 1C.02, any engineering and traffic investigation shall be documented in writing. Table 6.1, within the Wisconsin Speed Limit Guidance, helps summarize the local authorities on establishing speed limits per ss 349.11​:​

Table 6.1 Speed Limits and Local Authority

​Statuatory (Fixed Limits) per ss 346.57(4)​
​What local governmentsa can do per ss. 349.11(3) and (7)

​70 mph — Freeway/Expressway​​​​

​N/A
​65 mph —​ ​Freeway/Expressway
​N/A

​55 mph —​ ​State Trunk Highway​​​​

​N/A
​55 mph – County Tru​nk Highway
​Lower the speed limit to 50 or 45 mph
​55 mph – Town Road
​Lower the speed limit to 50 or 45 mph​
​45 mph – Rustic Road​
​Lower the speed limit to 40, 35 or 30 mph
​35 mph – Town Road
with average driveway spacing less than 150 feet
​Lower the speed limit to 30 or 25 mph
​25 mph – Inside corporate limits of a city or village 
​Raise the speed limit up to 55 mph
Lower the speed limit to 20 or 15 mph
​15 mph – Street or Town Road
adjacent to a public park
​Lower the speed limit to 10 or 5 mph
​15 mph – Alley
​Lower the speed limit to 10 or 5 mph
​15 mph – Pedestrian Safety Zone

(with a public transit stop)​

​No changes permitted
​Construction or temporary maintenance zones
​See TEOpS 13-5-16 and 13-5-17​
​School zone/School crossing

​See TEOpS 13-5-12​
​​Connecting Highway​

​Subject to WisDOT approval

(a) All speed limit changes shall be based on an engineering and traffic investigation, including modifications allowed under Statute. Local governments can implement speed limit changes on the local road system without WisDOT approval when proposals are within the constraints identified above.


State Highways (e.g., US 12, WIS 30)
When speed limit modifications are investigated on the state highway system, WisDOT follows its speed limit policy. Engineering and traffic investigations are completed by a professional engineer or traffic engineers under direct supervision of a professional engineer. For connecting highways, engineering and traffic investigations can follow the WMUTCD guidance, but will be subject to approval by a WisDOT professional engineer.

All speed limits must be declared and posted to be enforceable. Declarations must be established either by state statutes or through ordinances by the respective roadway authority or municipality. Regulatory speed limits are absolute speed limits, above which it is unlawful to drive regardless of roadway conditions, traffic volumes or other factors. Advisory speed limits are not enforceable in Wisconsin courts, except when driving too fast for conditions.

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.

Lower speed limits are often viewed as a quick fix to traffic safety, but this is not the case. Crashes are the combination of many factors. In many cases, simply posting a lower speed limit without changing the road context creates a greater speed variance between the slowest and fastest vehicles. This speed variance, also called “speed differential,” can contribute to crashes and make the roadway less safe. In order to reduce the frequency and severity of crashes applying speed management principles should be considered to establish an appropriate speed for the roadway. Visit the speed management page​ to learn more.​

This theory is only effective when law enforcement resources are available to commit. Voluntary driver compliance and respect for appropriate regulatory speed limits is the ultimate goal. The availability of police officers is typically limited for dedicated speed enforcement on a consistent basis. If speed limits are posted well below what most people are typically driving and not vigorously enforced, there will be varying speeds of traffic, which will increase the potential for crashes. In general, setting unreasonably low speed limits will also lead to a disregard of speed limits.

No. Several states utilize automated speed enforcement through speed safety cameras to help enforce speed limits on roadways. Wisconsin ss. 349.02 currently prohibits the use of any type of automated enforcement technology.

Yes. Speed limits are established with optimal conditions in mind. Further, Wisconsin ss. 346.57(3) defines conditions requiring reduced speeds. In situations such as approaching and crossing an intersection or railroad crossing, approaching or going around a curve, passing school children, highway construction or maintenance workers or by reason of weather or highway conditions, an operator of every vehicle shall drive at an appropriate reduced speed.

By policy, WisDOT does not lower speed zones strictly due to the presence, or planned presence, of an intersection. This includes intersections with stop conditions, traffic signals, roundabouts or access restrictions. WisDOT designs intersections using an appropriate speed to determine the design features of the roadway. This takes into consideration factors such as operating speed, topography, and adjacent land use. This means that rural intersections, and any proposed changes at these intersections, are designed such that they operate safely with higher travel speeds.

All speed limits in Wisconsin must be based an engineering and traffic investigation. If a speed limit modification is proposed to lower (or raise) a posted speed limit to meet statutory speed limits, an engineering and traffic investigation should document this decision. Statutory limits are established to ensure that every roadway has a speed limit, but decisions on adjusting speed limits should consider the roadway’s context, function and existing driving behaviors to determine the appropriate and safe speed. Setting speed limits without consideration of these factors may lead to compliance and safety issues without significant interventions (e.g., design changes, heavy enforcement).

Any requests to modify speed limits on the State Highway System must come through a local roadway authority, such as a city, village or township. If existing speeding issues are the primary concern, the best solution would be to work with law enforcement. WisDOT does not entertain requests to modify speed limits from individual citizens or advocacy groups. Local governmental authorities (e.g., Director of Public Works, village/town president/administrator, police chief) must submit a request to WisDOT with current regulatory speed limit information, the requested speed, begin/end points and reasoning for the request. WisDOT will then determine if a review of the speed limit is appropriate.

To initiate a request for WisDOT to review a speed limit for potential modifications on the State Highway System (e.g., US 12, WIS 64):

  • Local authority (e.g., town/village/city government official) submits a written request to WisDOT. The request should include reasoning for why the location should be investigated within an engineering and traffic investigation (i.e., engineering study).
  • WisDOT determines if an engineering study is appropriate for the location or if other changes are needed. If a study is completed, WisDOT reviews the results and makes a determination for potential changes.
  • WisDOT informs the local authority of the results. If changes are supported, WisDOT coordinates with the county highway department to install new roadway signs with the modified speed limits.

It's important to note the department will not consider modifications solely based on any of the following:

  • Noise complaints
  • Accommodating specialty vehicles (e.g., ATV/UTV)
  • Correcting spot safety concerns
  • Future concerns that have not yet occurred
  • Future development

Local authorities can initiate action to modify a speed limit and create a new regulatory speed zone on a local road through an engineering and traffic investigation. Local officials have a key role in setting limits. They must balance the competing concerns and opinions of drivers, residents and law enforcement agencies with statutory requirements and traffic safety. Any change must be supported by an engineering and traffic investigation adhering to the Wisconsin state statutes. This should be conducted by a professional engineer or engineering technician with appropriate traffic engineering expertise, or other qualified personal who are trained in the principles and practices of traffic engineering studies which follow procedures and criteria established by an engineer (e.g., Wisconsin's speed limit guidance​).

WisDOT recommends that local authorities coordinate with WisDOT prior to completing an engineering and traffic investigation to verify study requirements and approval authorities. For questions, please reach out to the appropriate ​ contact.

When changes to the local roadway system require WisDOT coordination and approval, follow the steps below:

  1. ​Local authority (e.g., town/village/city government official) receives request from citizen or another constituent.
  2. Local authority determines if an engineering and traffic investigation (i.e., engineering study) is appropriate for the location or if other changes are needed.
  3. Local authority prepares engineering study based on guidance provided by WisDOT.
  4. Local authority submits written request to WisDOT. Request should include reasoning for why the location is being investigated and provide a copy of the engineering study.
  5. WisDOT reviews the results and makes a determination for potential changes.
  6. If approved by WisDOT, modified speed limit is posted by local roadway employees.​

For situations where speed zone modifications are not justified, there are several options to stay engaged and make roadways safer for both vehicles and other roadway users.

  • Stay active through public involvement or county traffic safety commission meetings to voice concerns and issues within your community.
  • Improve visibility of reduced speed zones. Examples of this include:
    • Signing Improvements
      • Double marking the first instance of the reduced speed zone sign
      • Increasing the size and frequency of speed limit signs
      • Installing temporary flags on reduced speed zone ahead signs, or regulatory speed limit signs
      • Providing dynamic speed display devices at transitional areas. These are most effective when used at variable times and not as a permanent installation. Examples include:
        • Portable Speed Radar Trailer
        • Dynamic speed display signs
        • ​Providing dedicated traffic enforcement at variable times
      • Consider adjusting the roadway design through short-term or long-term changes.
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