Can you turn around in Circus Imperium?
Normally the rule of play is no, you cannot turn your chariot away from the forward path of the track. You can plot to ram in the figure 8 and are encouraged to damage the other chariots to the point of destruction.

Additionally, the ruling class watching would scream for a laser show to cut you and your beasts down if you tried a turnabout, well before your collision could occur...  Give the boys in the corner seats their cheers by smashing into the wall, leaping into the other player's chariot and kicking them into the oncoming frenzy.