I am in the process of adding some plywood decking to the floor of part of my attic, which is built from webbing-style trusses. In the picture below, the cross-brace marked with yellow arrows is a real thorn in my side, impeding travel from one area to another. How can I know if it is structurally required, or just a remnant of temporary bracing before the attic/roof was complete? Those exact same trusses are cross-braced at least 4 other ways, not counting the roof sheathing, or the 1x4 furring strips I installed below my flooring.

I'm worried that the green splotches of spray-paint are in someway meaning 'permanent cross-brace is needed here'. :(

(Please ignore the shoddily draped phone & cat5 wires, and the not-yet-nailed-down plywood flooring-- this is a work in progress.)

[EDITS: Added second picture for Bryce, and 3rd & 4th pictures for shirlock homes.]

![general picture of cross-brace in question](https://i.stack.imgur.com/Cyp0C.jpg)

![For user Bryce: shot of the roof above the brace](https://i.stack.imgur.com/itRnf.jpg)

![For user shirlock homes: the high end of the brace](https://i.stack.imgur.com/ZOP3C.jpg)

![For user shirlock homes: the low end of the brace](https://i.stack.imgur.com/F0wCw.jpg)

Outside view of garage, showing roof-line, truss orientations, and brace orientation.
Note that all of the trusses in the house run in this same orientation, regardless of what the roof-line is doing.
![For user shirlock homes: outside view of roof](https://i.stack.imgur.com/3GCAD.jpg)

View of garage ceiling, showing brace position relative to trusses.
![For user shirlock homes: inside view of garage ceiling](https://i.stack.imgur.com/DIaxK.jpg)