Jack off/ Edge while driving ? Yes, but i dont think i ever got off while driving just kept it hard and leaky.....
Especially say, driving along highway 80 in Ca./ NV. on a really warm day....A long day of driving through the desert or through the Sierra Nevada Mtns....Even in middle age now, I still get super hard on some days on a long drive. There are so many logging roads and dusty backroads all of which have killer views, id usually turn off to actually get off however.