filled with mortar. Before the work was completed, locals nicknamed the track "The Brickyard". Combined road course A Combined road course, colloquially referred to as a "roval" (a blend word combining "road course" and "oval") is an oval track racing facility that features a road course in the infield (and/or outfield), that is usually linked to the oval circuit. This type of course makes for a multi-purpose track, and allows the facility to be used for both oval and road racing. A typical combined road course consists of the oval portion of the track, using the same start/finish line, and same pit area, but a mid-course diversion to a winding road circuit in the infield (and/or outfield). At some point, the circuit leads back to the main oval, and completes the rest of the lap. On some of the faster ovals, a chicane is present on long back-straights, to keep speeds down, and create additional braking/passing zones. Some more complex facilities feature a stand-alone road course layout(s) in the infield not directly linked to the oval layout, or otherwise using only a short portion of the oval. Combined road courses combine the high speed characteristics of ovals with the technical precision of road courses. It allows road racing disciplines the unique experience of being held in the stadium style atmosphere of an oval superspeedway. Numerous combined road courses saw widespread use with sports cars in the 1970s and early 1980s. However, their use at the professional level has since diminished considerably, since most layouts lacked the desirable topography and competitive challenges of natural road courses. In addition, most combined road course circuits offer poor sightlines for fans sitting in the grandstands. Oftentimes the challenging infield portion is obscured or not visible at all from the grandstands that line the circumference of the oval track, so many fans choose to view from the ground level inside the infield – leaving the grandstands mostly empty and unsightly. Many combined road course layouts have been abandoned, or are used only for testing and amateur race meets. Since 1962, the most famous race continuously held on a combined road course has been the 24 Hours of Daytona. Since 2018, NASCAR has held the Bank of America Roval 400 on a combined course at the Charlotte Motor Speedway. In some rare examples, the combined road course layout is run in the opposite direction to the