Realigned or Reconstructed Routes

When a route is extended or reconstructed such that it follows a significantly different alignment, certain rules are applied to ensure that new markers can be placed that do not duplicate existing ones. At the beginning of the new section of roadway, the first marker is placed so as to continue the tenth-mile interval from the previous existing marker. Where the new alignment rejoins the old, the same tolerance is used (±0.05 miles) as at the end of a control segment (see page 1). Besides this, the new alignment can be accounted for by altering one or more of the following marker components:

County order: If a new alignment crosses a county line that the old roadway did not cross, the county order number used is the next higher number available for the entire route. (County order numbers also increase when there are more than nine control segments in a county, as on the Hutchinson River Parkway in Westchester County.)

Control segment: This digit will only be changed if the sequencing numbers cannot be increased by 100 (see below). If this is the case, the control segment number is increased by one. Other instances where the control segment number is increased include discontinuous routes within the same county (as on NY 24 in Suffolk County) and routes that cross the state line (such as NY 17 in Pennsylvania).

Sequencing numbers: In cases where simply continuing these numbers from the old alignment would cause duplication, the first of the three sequencing digits is increased by 1 and the others continue normally (in some cases the sequencing numbers will reset to x00). Such cases would include an extension to the west or south (i.e., before a reference marker ending with 1000), or assignment of a new route number to the old alignment with the old route number retained on reference markers.

Example: The last marker of the old alignment has a bottom line of 1057. The first marker on the new alignment would read 1158.

Installation Guidelines

Makers are placed on 7, 8 or 12-foot flanged steel posts. They are placed, where applicable, in line with the reflective delineators or just behind the guard rail. Markers within 50 feet of a delineator shall take the place of this delineator. Markers within 50 feet of existing sign or light posts (maintained by official agencies) should be affixed to these posts. Markers may also be affixed to bridges, retaining walls and similar features.