FEDERAL-AID POLICY GUIDE
December 9, 1991, Transmittal 1
NS 23 CFR 620A
OPI: HNG-13
(1) Any Federal-aid highway project within 2 miles of an airport should be carefully examined to determine if there is a possi bility for conflict and if coordination is required.
(2) Any highway project on which mobile objects are shielded by existing structures of permanent and substantial character or by natural terrain or topographic features of equal or greater height or which are located more than 2 miles from an airport will, normally, not require coordination.
(3) No coordination is required on those projects which may be considered stage construction of projects previously coordinated and which do not result in increased elevation of critical project elements previously coordinated.