Yes indeed we must know some tricks and it's always good to know. However, given the ever more sophisticated means used to make money for the government, the only hope of escaping this racket is to change our habits and make himself small. Who does not know that the speed is not responsible for all the evils which he is accused: several factors are crucial: the drink and drugs, then comes inattention or fatigue causing drowsiness and then the quality of taxiways. But hey, if you become wise, the government will find something else to tax cows taxes we are ..... Olive