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On October 28th, 1942, in the midst of World War II, the state of Utah decided to reduce its speed limit to 35 mph (56 km/h) in an effort to save tires and gas. Enforcement of the so-called ''Patriotic Speed Limit'' began on November 10th.
A study by the National Safety Council showed that 46% percent of cars driven by war workers had at least one tire with the tread worn smooth; 23 percent with at least two tires worn smooth; and 11 percent with at least three.
The old speed signs were stored until the limit was raised in 1943.
Meanwhile, car accidents in Utah dropped 35% from 1941-1943, and fatalities decreased by almost 50%.
Source: Mystery of Utah History
A study by the National Safety Council showed that 46% percent of cars driven by war workers had at least one tire with the tread worn smooth; 23 percent with at least two tires worn smooth; and 11 percent with at least three.
The old speed signs were stored until the limit was raised in 1943.
Meanwhile, car accidents in Utah dropped 35% from 1941-1943, and fatalities decreased by almost 50%.
Source: Mystery of Utah History