On multilane roadways and busier two-lane roads, lanes are designated with road surface markings. In Fitzhugh SH-1 becomes a multilane highway. The highway is two-lane surface road with the exception of various urban multilane road sections. This route was moved to a multilane divided highway alignment north of Rutherford by 1937. US 25E remains a multilane divided highway for its entire extent in Kentucky. Western High-Speed Diameter (WHSD) is a multilane motorway running from the South to the North. Longer gaps are required for trucks and buses, and for multilane roads. The stretch from here to Strubble Road is a quite busy multilane highway. US 321 is a multilane highway beginning at the state line. As it follows WIS 100 north, it becomes an urban multilane road. In the 1950s, PA 42 was upgraded to a multilane road between Centralia and Aristes. US 30 was widened into a multilane road between York and Lancaster in the 1930s. However, the multilane sections through LaPlace and Hammond carry a speed limit of .