[RajatPawar]

The most easy way is to do this:

pawn Код:

enum pInfo
{
    bool:in_DERBY
}
new PlayerInfo[MAX_PLAYERS][pInfo];

public WHERE_YOU_CODED_YOUR_AUTO_REPAIR_SYSTEM
{
       if(!PlayerInfo[playerid][in_DERBY]) // The player's not in a derby
       {
            SET TIMERS, YOUR CODE, ETC.
        }
        else // DO NOTHING.
}

Remember to set the bool to true and false when ever the player enters/leaves the derby. There are many other options, but the easiest is this!