Which traffic law can NOT be enforced on private property?

The enforcement of traffic laws on private property can vary, but it is generally accepted that certain laws, particularly those related to the regulation of vehicles, are more applicable to public roadways. Speeding is typically viewed as a violation that occurs in public spaces where traffic regulation is inherently tied to public safety and order. Private property is often not subject to the same strict enforcement of speed limits because such properties do not belong to the government but rather to individuals or private entities.

In contrast, laws such as DUI, reckless driving, and handicap parking can be enforced on private property. DUI laws apply universally, as driving under the influence poses a threat to public safety regardless of where it occurs. Reckless driving also presents similar concerns for safety that apply to both public and private spaces. Finally, handicap parking laws are designed to protect accessibility rights and can be enforced anywhere designated spaces exist, including private property.

Thus, while certain traffic laws can be enforced on private property, speeding is not among them in the same way, making it the correct choice for this question.