Road America
Road Americaは「世界最速の恒久的なロードコース」と主張しており、平均時速95マイルの圧倒的なスピードを誇っており、これに反論できる他のレースコースはあまりありません。このコースは、ミルウォーキーから北に60マイル離れたElkhart LakeのKettle Moraineの丘陵地帯の640エーカー（260ヘクタール）に1955年4月に舗装されました。高速道路のエンジニアであるClif Tufteは、1950年代初頭にElkhart Lakeの当局がストリートレースを禁止した後、ロードコースを建設するアイデアを思いつきました。 彼が設計・建設した14のターンを持つ4.04マイルのトラックは、WeatherTech SportsCar Championship、IndyCar、NASCAR Cup、NASCAR Xfinity、MotoAmerica、American Le Mansなどの多くのハイプロファイルのモータースポーツシリーズに欠かせない存在です。これらのイベントの合計観客数は毎年80万人を超えます。
ウィスコンシンの湿潤大陸性気候は、多雨で温暖な夏と、気温が30℉以下になる寒く雪の多い冬があります。それでも、Road Americaでは有名なWinter Autocross Seriesを含む400以上のイベントが毎年開催され、気候条件に関係なく開催されます。 トラックのレイアウトは高速走行に最適で、長い直線とスイーパーがあり、ドライバーの視点から垂直な壁のように見えるフィニッシュラインに近づく1つのエレベーションチェンジなど、素晴らしい高低差があります。
Road America's Current configuration preserves the 6.472-kilometer 'National Park of Speed' layout that has defined Wisconsin road racing since 1955, featuring 14 turns across 259-hectare facility near Elkhart Lake where recent repaving modernized surface characteristics while maintaining the circuit's fundamentally unchanged geometry that makes it North America's premier natural-terrain road course. This FIA Grade Two circuit combines long straights rewarding top speed with technical sections demanding precision through corners following natural landscape contours rather than bulldozed flat design, creating the balanced character that attracts IndyCar Series, IMSA SportsCar Championship, MotoAmerica Superbike Championship, and numerous club racing organizations year-round. The Current designation distinguishes this modern-surface variant from historical configurations, though Road America's layout remains remarkably consistent with founder Clif Tufte's 1955 original vision where minimal geometry changes across seven decades demonstrate timeless circuit design.
The Current configuration's character derives from preserved classic layout combined with contemporary surface quality. Recent repaving created the 'National Park of Speed' descriptor celebrating smooth asphalt and modern grip levels, but the 14-turn geometry maintains traditional challenges: Turn 5's off-camber Carousel demands precise line selection, the Kink's high-speed compression tests courage at 240+ kph, Turn 12's hairpin requires patience before Canada Corner's final complex. The 6.47-kilometer distance creates lap times around 2:00-2:10 for professional prototypes and open-wheel cars, making it one of North America's longest permanent road courses where mistakes in any of 14 corners cost significant recovery time. Wisconsin's continental climate creates dramatic seasonal variation—summer events see track temperatures approaching 40°C while spring and fall races operate in cool conditions, with afternoon thunderstorms common during racing season. Road America's 640-hectare facility preserves vast run-off areas and spectator viewing opportunities across natural amphitheater terrain. The Current configuration particularly showcases how classic 1950s circuit design remains relevant in modern motorsport, where recent surface improvements enhance rather than compromise the fundamental layout that established Road America's reputation as North America's most complete natural-terrain road racing challenge.
