The first four times around the track, a few bikers in unique black Sanchez dirtbikes will chase you. The fifth time, there will be a security guard in a black Rancher.
You can keep playing this mission once you've completed it. Each time you beat your time record, you receive a higher prize (in money).
Due to a bug in the game, the initial scores of both Trial By Dirt and Test Track will have the same time results once both scores are listed in stats. Once you play the missions again and beat each time, the scores will be individual as they should be.
|GTA Vice City "Trial by Dirt"(02:21)|