[DanishHaq]

Try OnPlayerStateChange:

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(oldstate == PLAYER_STATE_ONFOOT && newstate == PLAYER_STATE_DRIVER) // Player entered a vehicle as a driver
    {
        new vehicleid = GetPlayerVehicleID(playerid);
        if(vehicleid >= 596 || vehicleid <= 599) return SetPlayerWantedLevel(playerid, 4);
    }
    return 1;
}

I don't see why the first method shouldn't work, are you sure you're in vehicle ID's 596, 597, 598 and/or 599? Try that anyway from above.