---identifier: "/us/cfr/t23/s630.404"source: "ecfr"legal_status: "authoritative_unofficial"title: "23 CFR § 630.404 - Standards."title_number: 23title_name: "Highways"section_number: "630.404"section_name: "Standards."chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"subchapter_number: "G"subchapter_name: "ENGINEERING AND TRAFFIC OPERATIONS"part_number: "630"part_name: "PRECONSTRUCTION PROCEDURES"positive_law: falsecurrency: "2026-04-05"last_updated: "2026-04-05"format_version: "1.1.0"generator: "[email protected]"authority: "23 U.S.C. 106, 109, 112, 115, 315, and 402(a); sec. 1110, 1501, and 1503, Pub. L. 109-59, 119 Stat. 1144; Pub. L. 105-178, 112 Stat. 193; Pub. L. 104-59, 109 Stat. 582; Pub. L. 97-424, 96 Stat. 2106; Pub. L. 90-495, 82 Stat. 828; Pub. L. 85-767, 72 Stat. 896; Pub. L. 84-627, 70 Stat. 380; sections 1303 and 1405, Pub. L. 112-141, 126 Stat. 405; and 23 CFR 1.32 and 49 CFR 1.81 and 1.85."cfr_part: "630"---
Identifier
/us/cfr/t23/s630.404
Currency
2026-04-05
Positive Law
No
Updated
2026-04-05
Chapter
Federal Highway Administration, Department of Transportation
Authority
23 U.S.C. 106, 109, 112, 115, 315, and 402(a); sec. 1110, 1501, and 1503, Pub. L. 109-59, 119 Stat. 1144; Pub. L. 105-178, 112 Stat. 193; Pub. L. 104-59, 109 Stat. 582; Pub. L. 97-424, 96 Stat. 2106; ... 23 U.S.C. 106, 109, 112, 115, 315, and 402(a); sec. 1110, 1501, and 1503, Pub. L. 109-59, 119 Stat. 1144; Pub. L. 105-178, 112 Stat. 193; Pub. L. 104-59, 109 Stat. 582; Pub. L. 97-424, 96 Stat. 2106; Pub. L. 90-495, 82 Stat. 828; Pub. L. 85-767, 72 Stat. 896; Pub. L. 84-627, 70 Stat. 380; sections 1303 and 1405, Pub. L. 112-141, 126 Stat. 405; and 23 CFR 1.32 and 49 CFR 1.81 and 1.85.
# 630.404 Standards.(a) Highway purposes may best be served by the establishment of station markings for horizontal control along Federal-aid highway routes at spacings of three to eight kilometers (about 2 to 5 miles) and station markers for vertical control of spacings no closer than one kilometer. These requirements may be waived only with the approval of the Administrator.(b) Projects should be of sufficient scope to permit efficient use of field parties. Projects should extend at least 30 kilometers. Projects may be coordinated with adjoining States to attain greater efficiency.(c) Where geodetic station markers cannot be established inititally at points readily accessible from the Federal-aid route, or where unavoidable circumstances result in their being established within construction limits, supplemental projects may later be approved to set and survey markers at satisfactory permanent points, preferably within the right-of-way but at points where their use does not introduce traffic hazards.