Hi here is an example on how to include a route in a workflow so that in a previous activity if the value of a field in a particular form is either 4 or 5, the HQ has to complete an investigation else (level = 1 to 3) the manager can close the case right away.
Let's see how I succeed:
1 - Designed my workflow 
2- Set the conditions on my route's transitions
3- Apply my workflow variable level
4- Map the wf variable to severity level in accident form
Hope this will help a lot of people
Ciao!