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2009 Edition Part 2 Figure 2E-19. Example of Interchange Numbering for Mainline and Circumferential Routes
Figure 2E-19. Example of Interchange Numbering for Mainline and Circumferential Routes
This figure shows an example of interchange numbering for mainline and circumferential routes.
The figure shows a map of three Interstate routes: a circumferential route labeled Interstate 473, an east-west route labeled Interstate 22, and a north-south route labeled Interstate 73, each of which is shown with several exits to crossing highways. On all three routes, black dots denoting reference location signs accompanied by numbers are depicted spaced at intervals along the route, and each of the exits is shown with an interchange number.
At the top right of the figure, a black capital letter "N" is shown superimposed on an upward-pointing vertical black arrow, denoting the compass direction. A legend is shown at the bottom of the page. It shows a white disc superimposed on a black square, labeled "JUNCTION OF TWO INTERSTATE ROUTES"; the numeral "2" inside a black circle, labeled "INTERCHANGE NUMBER"; a black dot superimposed on a vertical black line, labeled "REFERENCE LOCATION SIGN," and an Interstate route shield with the numeral "73," labeled "INTERSTATE ROUTE NUMBER."
The circumferential route, Interstate 473, is shown as roughly circular in shape. The numbering of interchanges along the circumferential route starts at the southern junction of Interstate 73 with Interstate 473 and proceeds clockwise. The circumferential route shows the following interchanges and numbered reference location signs:
- Reference location sign 1
- Reference location sign 2 and interchange 2, a partial diamond interchange
- Reference location sign 3
- Reference location sign 4
- Reference location sign 5 and interchange 5, a diamond interchange
- Reference location sign 6
- Reference location sign 7 and interchange 7, a minor diamond interchange
- Reference location sign 8
- Reference location sign 9 and interchange 9, the eastern junction with Interstate 22. This is also interchange 109 on Interstate 22.
- Reference location sign 10
- Interchange 10, a diamond interchange, and reference location sign 11
- Reference location sign 12
- Interchange 12, the northern junction with Interstate 73. This is also interchange 17 on Interstate 73.
- Reference location sign 13
- Reference location sign 14
- Reference location sign 15 and interchange 15, a diamond interchange
- Reference location sign 16
- Reference location sign 17
- Reference location sign 18
- Future Interchange 19, a future diamond interchange, denoted by broken lines, and reference location sign 19
- Reference location sign 20
- Reference location sign 21
- Interchange 21, the western junction with Interstate 22. This is also interchange 117 on Interstate 22.
- Reference location sign 22
- Interchange 23, a diamond interchange, and reference location sign 23
- Reference location sign 24
- Reference location sign 25
- Reference location sign 26
- Interchange 26, a diamond intersection, and reference location sign 27
- Reference location sign 28
- Interchange 28, the southern junction with Interstate 73. This is also interchange 7 on Interstate 73.
The east-west route, Interstate 22, is shown as mapped from the northwest to the east. The numbering of interchanges along the east-west route starts in the northwest and proceeds east. The east-west route shows the following interchanges and numbered reference location signs:
- Reference location sign 107
- Interchange 107, a minor diamond interchange, and reference location sign 108
- Reference location sign 109
- Interchange 109, the western junction with Interstate 473. This is also interchange 9 on Interstate 473.
- Reference location sign 110
- Interchange 111, a diamond interchange, and reference location sign 111
- Reference location sign 112
- Reference location sign 113
- Interchange 113, the junction with Interstate 73. This is also interchange 12 on Interstate 73.
- Reference location sign 114
- Interchange 115, a diamond interchange, and reference location sign 115
- Reference location sign 116
- Reference location sign 117
- Interchange 117, the eastern junction with Interstate 473. This is also interchange 21 on Interstate 473.
- Reference location sign 118
- Interchange 118, a minor diamond interchange
- Reference location sign 119.
The north-south route, Interstate 73, is shown as mapped from the south to the north. The numbering of interchanges along the north-south route starts in the south and proceeds north. The north-south route shows the following interchanges and numbered reference location signs:
- Reference location sign 5
- Reference location sign 6
- Interchange 6, a minor diamond interchange
- Reference location sign 7
- Interchange 7, the southern junction with Interstate 473. This is also interchange 28 on Interstate 473.
- Reference location sign 8
- Reference location sign 9
- Interchange 10, a diamond interchange, and reference location sign 10
- Reference location sign 11
- Reference location sign 12
- Interchange 12, the junction with Interstate 22. This is also interchange 113 on Interstate 22.
- Reference location sign 13
- Interchange 14, a major diamond interchange, reference location sign 14, and interchange 14
- Reference location sign 15
- Reference location sign 16
- Reference location sign 17
- Interchange 17, the northern junction with Interstate 473. This is also interchange 12 on Interstate 473.
- Reference location sign 18
- Interchange 18, a minor diamond interchange
- Reference location sign 19.
