"I have complete faith he did Confund the examiner"
-- Rose Granger-Weasley (CC1.2)
At his test for getting a Muggle driver’s license, Ron uses magic to help him and to manipulate the person overseeing the test. Deserved or not, Ron passes the test (DH/e).
He boasts that, although Hermione thought he would have to use a Confundus charm on the Examiner to get through, he was able to pass without having to do so. His daughter Rose is doesn’t think that he is being truthful about this (CC1.2). However, he does admit to Harry that he did have to Confund the Examiner because he forgot to look in his wing mirror. Ron thinks that he is justified because because when driving he would be able to use a Supersensory Charm instead of the mirrors in any case (DH/e).
All we really know is that it happened sometime before Ron drove his family to King's Cross on 1 September, 2017. It had probably happened fairly recently at that point, since he had not yet told Harry and Ginny about it (DH/e).
In the epilogue, Harry and Ginny's family apparently arrives at King's Cross by car. And Ron and Hermione's family seems to have done the same, given the discussion of Ron passing a Muggle driving test. Has taking cars to King's Cross become a widespread custom in the Wizarding world? Is it something everyone in the Weasley clan does? Ron talks of using the Supersensory Charm instead of checking the mirrors, but there's no indication of whether or not that is legal under wizarding law. It seems strange that Ron would want to meddle with a car and use magic on if after his experiences with his father's flying Ford Anglia. -BB
The fact that Ron took (and passed) a Muggle driving exam means that the Muggle government has record of his existence. If, as suggested above, driving Muggle cars is becoming more popular with wizards, are they suddenly being documented by the Muggle government? Even supposing huge numbers of people could all successfully forge other documentation, wouldn't this send up red flags for the Muggle government? Are the employees of the U.K.'s Driver and Vehicle Licensing Agency being confunded and possibly obliviated frequently and in large numbers? -BB