Travel policy can be divided into two areas: general settings and travel policy by groups. Both can be adjusted in the "user details" of the user via "Policy and Restrictions".
In the general settings can be defined certain parameters. Among others, what happens after a violation of the travel policy. For example, you can specify whether the traveler must enter a justification for the violation and/or whether the registered manager (manager approval activated) receives an immediate notification of the violation.
For the travel policies, are created user groups to which a specific policy applies. Then the users are assigned to the appropriate group. If the travel policy is the same for all company employees, it is sufficient to set up one group. How to set up an user group please read here.