Which of the following is NOT a typical safety feature of the Highway Transportation System?

The correct answer is race tracks because they are not designed as part of the Highway Transportation System (HTS) for public safety. The Highway Transportation System consists of roadways, vehicles, and roadway users, with a primary focus on facilitating safe, efficient travel for the general public.

In contrast, race tracks are specifically constructed for motor racing events and do not serve the general traffic or safety needs of everyday drivers. The other options, such as electronic notification signs, street lights, and traffic signals, are all integral safety features of the HTS. These features inform and direct drivers, help regulate traffic flow, and enhance visibility and safety on public roadways.