The strange history of homologation cars, and why a few paragraphs buried in a racing rulebook gave us some of the most desirable road cars ever made.

The 24 Hours of Le Mans, FIA World Endurance Championship and, possibly, IMSA's WeatherTech SportsCar Championship, could take a page from the 1990s when the next set of top-tier prototype regulations are finalized. Extremely early discussions on the replacement for the current LMP1 class in 2020 have included questions as...