travel time reliability

Answer the questions bellow ( 1-2 sentence will be enough) using the provided link
1-Define travel time reliability?
2-Explains the deferent between recurrent and non-recurrent congestions?
3- Explains how travel time reliability is used in different parts of transportations?
Link:
http://www.citetraining.com/atutor/login.php

user name: NAU_asaud
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