[XGh0stz]

Код:

OnPlayerChangeState(playerid,newstate,oldstate)
{
if(newstate==PLAYER_STATE_DRIVER)
{
GameTextForPlayer(playerid,"~w~Please drive like you~n~would in real life~n~Or you will be~n~~r~JAILED!!!",10000,3);
}
}

Off the top of my head and about to go to bed, but the code you ask for would be something like the above...
However, keep in mind that this will start to annoy your players, this goes off EVERY time they enter that driver seat...