Segment locks, also known as manual locks, are editing restrictions on certain road segments. This type of lock is manually applied by a higher-ranked editor to a particular segment of road that needs to be protected from accidental change or vandalism. The more important the road, the more likely it is to be locked.
Other than the fact that they are manually applied by an editor, they function similarly to automatic traffic locks. For an overall description of the various types of editing restrictions, see the [[Editing permissions] page.