When I see these signs in the summer, I wonder how tourists interpret "chain law."
Chain Law means that the road is hazardous (usually blowing and drifting snow with poor visibility and little or no traction) and that tire chains are required. These warning signs are commonly seen on Wyoming's mountain passes: this one is on the South Pass road where the grade is steep and drifting snow is frequent during the winter. Because road conditions can change quickly in the mountains, the flashing lights, only turned on in extreme conditions, should be heeded.
Do you have signs in your area that might cause a tourist to ponder their meaning?