What is the IRLs relationship to NASCAR?
There is no official relationship between the IRL and NASCAR as such. One IRL event (Phoenix) is scheduled at a track owned by the International Speedway Corp., which is controlled by the France family which also owns NASCAR. (There are rumors of other IRL events at ISC-owned tracks.) The IRL does interface to NASCAR, as it does to all of the other major U.S. sanctioning bodies, via its membership in the ACCUS coordinating body.