[Castle]

I suggest making it into a callback...
Example:

pawn Code:

forward SendCarMessage(color, string[]);

public SendCarMessage(color, string[])
{
    for(new i = 0; i < MAX_PLAYERS; i ++)
    {
    if(IsPlayerConnected(i))
      {
        if(IsPlayerInVehicle(i, GetPlayerVehicleID(i)))
            {
            SendClientMessage(i, color, string);
            }
      }
    }
}