I thought this was kind of cute strategy which apparently worked..
Why Wisconsin Has Speed Limit Signs With Decimal Points https://www.jalopnik.com/2181718/why-some-wisconsin-speed-limit-signs-have-decimal-points/
"... a recycling and solid waste facility in Appleton, Wisconsin, about 107 miles north of Milwaukee, believes it has a trick to get the attention of even habitual speeders: a posted 17.3 mph speed limit. .... in an attempt to catch the eyes of passing vehicles and force awareness of the low, oddly specific speed limit. .. "Why 17.3? Because it makes you pause. It makes you look twice. And most importantly, it breaks that 'autopilot' feeling we can all fall into when driving familiar routes." ...
After posting the unusual speed limit sign, Kraig Van Groll, the superintendent of solid waste at the recycling facility, told Supercar Blondie that all vehicles coming through the facility's parking lot "have started moving through the facility differently." .... A few years ago, a parking lot in Colorado Springs, Colorado, posted an even-lower speed limit of just 8.2 mph. The sign in the parking lot didn't look nearly as official, but it got similar attention from passing motorists. ..."
The point of the strange speed limit sign is to catch drivers off-guard and shake them out of their autopilot mode, which may work the first time or two passing by the sign, but like everything in life, its novelty and thus effectiveness is likely to wear off with repeat visitors. What do you think, would seeing a 17.3 mph speed limit sign cause you to think twice about speeding?
Read More:> https://www.jalopnik.com/2181718/why-some-wisconsin-speed-limit-signs-have-decimal-points/