Which of the following is considered a traffic infraction in Kansas?

Speeding is classified as a traffic infraction in Kansas because it specifically pertains to violating regulations regarding vehicle operation on roadways. Traffic infractions are generally less severe than misdemeanors or felonies and often result in fines rather than criminal charges. Speeding essentially falls under rules designed to promote safety on the roads, which is why it is managed within the realm of traffic law.

In contrast, driving without a valid license is typically treated more seriously, often classified as a misdemeanor. Assaulting another driver is a criminal offense that can lead to serious charges, such as battery. Theft is also a criminal act that is categorized under property crimes and is certainly beyond the scope of a traffic infraction. Hence, among the provided options, speeding is the only one that aligns with the definition of a traffic infraction.