People get panicked in bumper to bumper traffic. Speeding has to be treated like an addiction. People resist the idea that speeding is dangerous and immoral, and become hostile and irrational when discussing it. It is common for a driver to feel resistance in using the brakes, partly because speed is an addiction, and partly because of the operation of the Law of Least Effort in driving. Just let her ride.
Traffic refers to the environment of drivers.
This includes physical, social, and psychological dimensions. The traffic environment can be viewed as a social-psychological field containing strong and weak forces that influence and determine the behavior and state of drivers. Psychological forces acting on drivers include their moment to moment interpretation of traffic situations and events. Drivers use various signals to show their driving intentions. Some of these are official such as the turn signal.