Rules question: Mire

[armyduck95]

This is actually a modern PzG question, but believe PzG has the same Mire rules.
1. can a unit that is mired still fire? Looking at the rules it seems like "Yes", just not move. I ask since they are marked with a "move/Fire" marker and wondered if that precluded activation.

2. Do you start removing the move/fired markers in the admin phase of the same turn the unit became mired? or in the next turn? (looks like same turn)

3. Does a road running through a marsh get the same TEC effect for being marsh or moving into the road hex OR is the road hex considered "clear" ?