1) Perception

2) Intellection

3) Emotion

4) Violation

1)Perception time: is time required for the sensations received by the eyes or ears of the driver to be transmitted to the brain through the nervous system & spinal cord or it is the time required to perceive an object or situation.

2)Intellection time : is the time require for the driver to understand the situation it is also the time required for comparing the different thoughts.

3) Emotion time: is the time elapsed during emotional sensational and other mental disturbance such as fear, anger or any other emotional feeling superstition etc

4) Volitiontime: is the time taken by the driver for the final action such as brake application.