I just got my Ohio drivers license, and believe it or not, I had to take the driving portion and the written portion of the test. (Never let your license expire lest you face my fate!)
In the process of prepping for the written portion of the exam, which all out-of-state license holders must take if they need an Ohio license, I learned a few things about Ohio driving laws. In perusing the Digest of Ohio Motor Vehicle Laws, I learned the following: (1) it is permissible to take roadkill home (be it deer or other creature) so long as you report it "to a game protector or other law enforcement officer within 24 hours;" (2) you can only make a left turn on red if you are turning from a one-way street to a one-way street; and (3) "Persons under the influence of alcohol, drugs or both are prohibited from walking on highways."
Knowing the traffic laws can keep you safe, but they're also important if you're ever a defense attorney. Your knowledge of the point laws (pp. 48-50 in the Digest) may mean the difference between a client losing his or her license (and potentially their job as a result) or simply paying higher fees or facing probation.
Traffic law is a big area of practice, and it's a great way for solos to develop an area of expertise and steady work---who doesn't know a person or four with a few traffic tickets in their past? The library has a great set for you to start building your traffic law knowledge before you set up a practice: