frost law
n.— «The Hillsdale County Road Commission announced seasonal weight and speed restrictions will go into effect on county roads as of Monday morning.…Stan Clingerman, Road Commission engineer manager, said the more commonly called frost laws, are designed to minimize damage to county roads from heavy loads during thawing weather.» —“Frost laws in effect on county roads” by Thomas Marcetti Hillsdale Daily News (Michigan) Mar. 4, 2008. (source: Double-Tongued Dictionary)
Further reading
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