Driving is such an unnatural thing with you right leg extended to operate the gas and brake. The seats in cars are not particularly designed to support the lower back and legs. This site offers some helpful advice. If you were a man named ellen (could happen) I would suggest getting rid of that triple fold wallet in your back pocket. That can aggravate the sciatic nerve.
http://www.sportsinjuryclinic.net/sport-injuries/low-back-pain/back-pain-and-driving
* When driving for prolonged periods the lumbar curve is all but lost, placing extra strain on the vertebrae and discs.
* The spine is subjected to considerable vibration and jolting.
* Modern cars have a lower roof line and so reduced internal space.To allow this the seat is often lowered and tipped back which causes the legs to be straighter, placing strain on the hamstrings, in turn pulling on their pelvic attachments and resulting in the pelvis rolling backwards.
* Strain is also placed on the cervical spine (neck) due to the seat being tipped back and the driver having to flex the neck by up to 20 degrees in order to look straight ahead.
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