A work zone near the Outagamie County Recycling and Solid Waste facility in Wisconsin has implemented a speed limit of 17.3 mph [1].
This unusual limit is designed to force drivers to pay closer attention to their surroundings. By using a non-standard number, officials hope to break the monotony of typical speed signs and reduce the risk of accidents in a high-traffic work area.
Details of the sign emerged in August 2024 [2]. The specific limit of 17.3 mph [1] is currently in effect to encourage drivers to slow down and remain vigilant in the busy zone.
According to reports, "Drivers entering the facility need to drive no faster than 17.3 mph," a reporter said.
While most speed limits in the U.S. are set in five-mile-per-hour increments, the use of a decimal point is rare. The measure is intended to act as a psychological trigger—triggering a driver's curiosity or confusion which then leads to them checking their speedometer more frequently than they would for a standard sign.
Local officials have not provided further details on how the enforceability of this specific limit is handled by law enforcement. However, the primary goal remains safety through increased driver awareness in a zone where heavy machinery and workers are present.
“A unique decimal-point speed limit was implemented near a recycling facility in Outagamie County to increase driver awareness.”
The implementation of a specific speed limit like 17.3 mph is an example of 'nudging' in public safety. By disrupting the pattern of 5-mph increments, disrupting the pattern of 5-mph increments, authorities are using psychological triggers to combat driver autopilot, effectively turning a speed sign into a cognitive challenge that forces the driver to consciously engage with their environment.
