User:40bus/State highway numbering ideas

This page lists ideas of U.S. state highway numbering systems.

The ideas 1-4 use grid with odd numbers running north-south and even numbers running east-west.

Idea 1

 * bypass routes are numbered SR 1-SR 9, from east to west or from north to south
 * main north-south highways are numbered SR 15-SR 95, from east to west, last number 5
 * main east-west highways are numbered SR 10-SR 90, from north to south, last number 0
 * auxiliary highways are numbered SR 11-SR 99; north-south roads with odd numbers consecutively from east to west beginning from SR 11 and east-west roads with even numbers consecutively from north to south beginning from SR 12, last number any other than 0 or 5

Idea 2

 * north-south highways are numbered SR 1-SR 89, consecutively beginning from SR 1, from east to west
 * east-west highways are numbered SR 2-SR 90, consecutively beginning from SR 2, from north to south
 * bypass routes are numbered SR 91-SR 99, from east to west or from north to south
 * spur routes are numbered in form of ordinal number + (0 if main highway number is between 1 and 9) + main highway number, e.g. SR 5 => SR 105, ordinal number increasing as one travels along main highway

Idea 3

 * main north-south highways are numbered SR 11-SR 91, from east to west, last number 1
 * main east-west highways are numbered SR 12-SR 92, from north to south, last number 2
 * auxiliary highways are numbered SR 13-SR 99; north-south highways are numbered SR 13-SR 99 consecutively beginning SR 13, from east to west, east-west highways are numbered SR 14-SR 98 consecutively beginnign from SR 14, from north to south
 * bypass routes are numbered in form of SR + ordinal number from 1 to 4 + main highway number in direction of main highway according to lowest-numbered state highway in the city, e.g. SR 37 => SR 137
 * spur routes are numbered in form of SR + ordinal number from 5 to 8 + main highway number in direction of main highway, e.g. SR 39 => SR 539
 * old alignments of routes are numbered in form of SR + 9 + main highway number, e.g. SR 32 => SR 932

Idea 4

 * north-south highways are numbered SR 1-SR 79 consecutively from SR 1, from east to west
 * east-west highways are numbered SR 2-SR 78 consecutively from SR 2, from north to south
 * spur routes are numbered SR 80-SR 89 consecutively from SR 80, from east to west or from north to south
 * bypass routes are numbered SR 90-SR 99 consecutively from SR 90, from east to west or from north to south

Idea 5

 * Classes: 1- and 2-digit highways, 3-digit highways, 4-digit highways.
 * System: 1- and 2-digit highways appear in clusters. 3-digit numbers are derived from 2-digit numbers by adding digits at the end, and 4-digit numbers are in turn derived from 3-digit numbers, again by adding digits at the end.

Idea 6

 * All highways are 3-digit.
 * Classes: numbers beginning with 1 or 2, numbers beginning with 3.
 * System: Numbers beginning with 1 are north-south highways, with the numbers increasing to the east. East-west highways have numbers beginning with 2, with the numbers increasing to the south. Numbers beginning with 3 are diagonal highways, with even numbers running northeast - southwest and odd numbers running northwest - southeast, increasing to the south.

Idea 7

 * Classes: highways 1-19, highways 20-99, 3-digit highways.
 * System: Highways 1-19 are numbered sequentially without a pattern. Highways 20-99 appear in clusters. Zones for 3-digit highways are determined by the first digit of all numbers with some exceptions. When a new highway 1-19 is built, the old highway gets a number which is 100 higher (e.g. the old SR 2 becomes  SR 102).

Idea 8

 * Classes: 1-digit highways, 2-digit highways, 3-digit highways.
 * System: The 1-digit highways are the most highways linking major cities in the state, and are assigned sequentially without a pattern. The 1-digit highway numbers define the zones for all other numbers: the areas around the highway x is zone x. 3-digit highways are less important than 2-digit highways. The highway xyz is always linked to the highway x.

Idea 9

 * Classes: 1-digit highways, 2-digit highways, 3-digit highways (regional highways).
 * System: The 1-digit highways are the most highways linking major cities in the state, and are assigned sequentially without a pattern. 2-digit numbers increase from 10 in west to the east, then to the north, and roughly clockwise through the state. Zones for regional highways are strict: when a road crosses a regional boundary, the number changes. Because of the first digit, the numbers are unique throughout the state.

Idea 10

 * Classes: highways 1-14, highways 15-99, highways 100-199, highways 200-399, highways 400-799, highways 800-1299.
 * System: Highways 1-14 are the most important highways in the state. Highways 1-5 are north-south routes increasing to the east, and highways 6-14 are east-west routes increasing to the north. Highways 15-99 are assigned in grid, with odd numbers running north-south, and increasing to the east, and even numbers running east-west, and increasing to the north. When a new highway 1-99 is built, the old highway gets a number which is 100 higher (e.g. the old SR 2 becomes SR 102), and these roads form highways 100-199. Highways 200-399 are numbered from 200 in the south to 399 in the north, highways 400-799 are numbered from 400 in the south to 799 in the north, and highways 800-1299 are numbered from 800 in the south to 1299 in the north.

Idea 11

 * Classes: Highways 1-10, highways 11-99, 3-digit highways.
 * System: Highways 1-10 are main roads from state capital. There is some clustering in numbers 11-99. The 3-digit highways are divided to three zones: zone 1 in the north, zone 2 in center and zone 3 in the south. There is some clustering within zones.

Idea 12

 * Classes: 1-digit highways, 2-digit highways, 3-digit highways, 4-digit highways.
 * System: 1-digit highways radiate in counterclockwise order from state capital. 2-d numbers appear in clusters. 3- and 4-digit highways appear in three zones: 1 in the west, 2 in the center and 3 in the east. There is some clustering within the zones. 4-digit numbers are derived from 3-digit numbers by adding a digit to the end.