I always did hand work in the car while DH was driving. Mostly knit or crochet, tried quilting but it was too bumpy and I like my stitches nice and even and small. Made 58 crazy quilt blocks and did all the embroidery in the car.
I miss that now that DH is gone and I have to do all the driving - I didn't realize how much time I was able to spend doing hand work in the car.