I have a herniated disc; can I drive a car?

As long as you have . A valid license and you are not taking any medication that may impair you for your symptoms related to the disc herniation. Sitting and driving may aggravate your symptoms and watch that your reaction time is not diminished by any of your symptoms like back &/or leg pain, numbness or weakness.
Yes. If your pain is worsened by driving, you may want to limit your time behind the wheel as you would for any activity that makes you feel worse. However you can drive.