[CoaPsyFactor]

pawn Код:

// Put this somewhere in your FS/GM, aslong its not inside { }
SendCarMessage(carid, color, text[])
{
    for(new i=0; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerInVehicle(i, carid) && IsPlayerConnected(i))
        {
            SendClientMessage(i, color, text);
        }
    }
    return 0;
}

//In your command add this:
SendCarMessage(carid, color, text[])

the last code would send to all players that are in any vehicle