Which of the following is one of the Three E's of traffic safety?

The correct answer is engineering. In the context of traffic safety, the Three E's refer to Engineering, Education, and Enforcement. Engineering encompasses the design and construction of roadways, signage, traffic control devices, and vehicles, all aimed at reducing accidents and enhancing the safety of road users. This aspect focuses on creating safer roadways and traffic systems, utilizing technology and infrastructure to minimize risks and improve overall traffic safety.

While education and enforcement are also critical components, they target the behavior and compliance of road users rather than the physical and technical aspects covered by engineering. These elements together work to form a comprehensive approach to enhancing traffic safety, but engineering stands out as the foundation upon which safe driving environments are built.