From
https://wiki.waze.com/wiki/Segment_length#Too_long

* Segments that extend outside of an editor's [[Waze_Map_Editor#Editable_Area|editable area]] cannot be modified in any way. Keeping roads shorter than 10,000 meters reduces the chances of editors running into more roads with this restriction.

This statement is not entirely accurate. I can change the segment geometry nearly as much as I like. I can't change the segment properties.



-----------------------------------------------------------------
Testing:

Test 1:
6.6km railroad segment , extending 4.6 km outside of my editable area, with one junction inside and one outside my editable area.

I AM NOT not able to:
* change its name or any other properties
* make changes at the junction which is outside my editable area

I AM able to:
* change its geometry, even adding, deleting, or moving geometry points well outside my editable area
* Make changes at the junction that is inside my editable area.

Test 2:
short street segment with one junction inside and one outside my editable area

AM able to:

• Change the segment name
• create a new junction node (cut with dummy driveway) INSIDE my editable area.http://i.imgur.com/R99KXNw.png
  http://i.imgur.com/VgOIAS0.png
• make changes at the junction that is inside my editable area
• change geometry throughout the entire length of the segment.

AM NOT able to:
[*] create a new junction node OUTSIDE my editable area
[*] make changes at the junction that is outside my editable area