Conclusion: In conclusion, most cars in Ohio do display two license plates, as the law requires. On average, over 90% of cars found at these stores had two license plates. One possible source of error is that we only went to these stores at one time. We could have reduced the possible error by going to these stores at different times and dates. The day (Sunday) could change the outcome compared to other days. However, in the end, the information seems accurate and matches up with state law.