 Complete the following phrase:  While intermediate speedways were designed primarily with stock cars in mind, they were also believed to be suited to host Indy cars as well. In the early years of the Indy Racing League, the series visited several intermediate tracks. The higher-downforce, normally aspirated IRL-type cars proved to be competitive at several of the tracks. The CART series however, mostly stayed away as the faster, more powerful Champ Cars were generally thought to be too fast for this type of circuit. This became evident at the 2001 Firestone Firehawk 600, when drivers experienced vertigo-like symptoms, and the race was cancelled for safety reasons. As of 2020, the IndyCar Series has only one race remaining at a high-banked intermediate track Texas. These tracks began to be removed from the Indy car schedule in the late-2000s and early-2010s due to low crowds and serious crashes, including the one at 