Are Radicals/Sports Prototypes allowed on a car track day? 27 April 2023 09:28 Updated Unfortunately, Radicals and Sports Prototypes are not permitted on Silverstone car track days. Related articles Can I use Slick Tyres? Is my vehicle insured while I’m on track? What are the noise restrictions? Can I bring additional drivers and spectators? Will my parking tickets show in the Silverstone Tickets App?