At a nominal 1700 pounds, I'd hardly call an SRF and "open wheel car". When Sports Renault started in the 80s, we in CSR disliked running with them because they took odd lines and were built like tanks.

In any case, at the SIC, they split started the SRFs and the small IT cars. It worked pretty well. By the time I got lapped the SRFs were pretty strung out.

P.S. If you can't see an SRF coming, you aren't looking in your mirrors or watching the flags enough.