I was prompted to ask about this after watching the recent BTCC races at Rockingham, which used the roval track inside the original oval track there. 'Rovals' are road courses within (and utilising part of) an oval race circuit. Other examples include the Indy GP track, the tracks at Laustizring and Oschersleben, Motegi and Daytona amongst doubtless many others.
But what was the first such track? Was it the Campbell circuit at Brooklands? I thought of Montlhery but that was built in 1924 as both road and oval from the outset (and the road part is outside the oval,although that is really splitting hairs!). Or were there any rovals before these?
And incidentally, as side issue, I see that the Lausitzring has a 'long' circuit of 11.3km as well as the oval and roval tracks. Has this ever been used for racing? This is post-2000 but might just scrape into TNF territory...