(Shippensburg) -- Single yellow lines down the middle of many rural, midstate roads will likely be left to fade away in response to new directives from PennDOT. The department has told municipalities the single stripe is not recognized by the federal government as a "traffic control device." If they don't comply, the agency warns townships could have their share of state gas taxes withheld. In Franklin County's Southampton Township, Supervisor Sam Cressler says they've used the single line on roads that don't qualify for the more common double line. "The majority of our local township roads are too narrow with low traffic volumes where the single yellow line has been our only option," Cressler explains. "To use the double yellow line we would have to study our road, guarantee there's minimum cartway width on both sides of the double yellow line," he says. Cressler says the lone stripe often serves as a guide for snow plows or helps drivers navigate rural roads in the fog or rain. PennDOT says it is trying to bring all of the state's roads into line with national standards.