Oklahoma State Highway 4
…Yukon. After crossing I-40, SH-4 becomes a two-lane road once again until entering Yukon, at which point it becomes a four-lane road again. It meets SH-66, once Route 66, in Yukon. Seven miles (11 km) later, it meets the Northwest Expressway (SH-3). It lasts for just three miles (4.8 km) longer until…