Regulation requiring a reasonably unitary environmental review for road-building projects incorporates an implicit requirement of sufficient length for discrete segments in its requirement that the segments have distinct terminii; a separate review of segment length is unnecessary.
A cumulative environmental review is unnecessary when the construction segments are de minimis.
http://www.ca5.uscourts.gov/opinions/pub/17/17-50683-CV0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.