Condition

From TTWiki

Vehicle conditions are affected by two elements of the game. Every time you send a vehicle out on a load, its condition will reduce by 1%. Also, there are random events that affect vehicle condition. These can reduce the condition by up to 10% (?). The lower the condition of a vehicle, the more likely it is to suffer events, and to breakdown entirely. When the condition of a vehicle reaches 0, the vehicle will be destroyed.

Vehicles can be repaired in the Garage. This requires time and money. Repair speed can be boosted by training your drivers in mechanical skills, while cost can be reduced using Workshops.