Boy, 10, steers his great-grandmother's car to safety after she collapses at the wheel on a highway - and he credits his driving skills to Mario Kart

By Daily Mail Reporter PUBLISHED: 00:56 EST, 10 August 2013 | UPDATED: 00:56 EST, 10 August 2013 10 View comments A 10-year-old boy helped steer his great-grandmother's speeding car