Check out the various types of ticket carefully: some grandstands and areas of the circuit require certain grades of pass and they're checked rigorously.
In 2014, Peru's Ministry of Culture changed the rules for the tickets, so read carefully the tickettypes available, what entrances they include and how much they cost!
This means that you must drive carefully and avoid: being involved in any typeof collision or accident, not just those that you're at fault, incurring any speeding tickets, and violating traffic laws.