Final answer:
The traffic conviction adding the most points usually includes serious offenses like DUI or reckless driving, while speeding and cell phone use while driving add points, but less so.
Step-by-step explanation:
The traffic conviction that typically adds the highest number of points to your driving record varies by jurisdiction, but serious offenses such as DUI (Driving Under the Influence), reckless driving, or causing a fatal accident can result in the most points. These points can lead to increased insurance rates, potential driving restrictions, or even the loss of driving privileges depending on the number of accumulated points and state laws. Since the question mentions a fictional study of speeding violations and drivers using cell phones, these are examples of violations that also add points, but in general are not as severe as the aforementioned infractions.