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New Hampshire/Major roads/Main

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Naming Standards

Numbered US Highways shall be named as: US-###
Numbered State Highways shall be named as: SR-###

Major Interstates

  • Interstate 89 - From Concord to Lebanon (60.80 mi)
  • Interstate 93 - (Portions Toll) From Salem to Littleton (131.39 mi)
  • Interstate 95 - (Portions Toll) From Seabrook to Portsmouth (16.11mi)
  • Interstate 293 - From Manchester to Hooksett (11.18 mi)
  • Interstate 393 - From Concord to Pembroke (4.50 mi)

Turnpikes

Locking roads

In New Hampshire we have a set minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked at least to the rank (level) in the chart below. Roads may be locked higher for protection and special situations (areas with construction, tricky design, frequent mistakes, imaging inaccuracies, and the like), but should not be locked lower.

A great time to implement these locks is while bringing the road types of an area into compliance with the current US road type standards (FC and highway systems). Lock the roads based on type after they've been set to current US road type standards.

New Hampshire Minimum Locking Rank Standard
Segment Type Statewide
 Freeway  5
 Ramp  Highest rank of connected segments
 Major Highway  3
 Minor Highway  3
 Primary Street  1 (Auto)
 Street  1 (Auto)
 |-|-|-|-|-|-|-|-|-| Railroad |-|-|-|-|-|-|-|-|-|  2
 • • • • Ferry • • • •   5
 Private Road  1 (Auto)

Note: Do Not Mass Edit just to update locks to these standards, these can adjusted as you find while editing other aspects of the segments such as FC, speed limits, naming, etc.

Some segments still warrant higher locks and care should be taken when setting segment lock to these standards to look for and protect these special setups with higher locks. Some examples; segments which are part of BDP, U-turn prevention, or using micro-doglegs, or other complex intersection setups.


Functional Classification of Roads

New Hampshire is participating in the new Functional Classification (FC) across the entire state. Some highways may be downgraded, others may be upgraded.

State FC Resources


NHDOT to Waze conversion table

The numbers correspond to the FC type indicated. (e.g. Class 6 road is a Minor Arterial)

Highway Systems
Interstate US Hwy (incl. some special routes) State Hwy (incl. some special routes) State Hwy BUS, SPUR[a], LOOP Locally-maintained
example>>>>> I-95 N US-2 SR-27 (SR-27A) SR-400 Loop Robertson St
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C
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  Interstate (1,11)    Fw  n/a n/a n/a n/a
  Other Freeways & Expressways (12)  n/a  Fw   Fw   Fw   Fw 
  Other Principal Arterials (2,14)  n/a  Major   Major   Major   Major 
  Minor Arterial (6,16)  n/a  Major   Minor   Minor   Minor 
  Major Collector (7,17)  n/a  Major   Minor   PS   PS 
  Minor Collector (8)  n/a  Major   Minor   PS   PS 
 Local Roads (9)  n/a  Major   Minor   PS   Street 

Match Rural FC labels to its Urban FC counterpart

A US Highway should never be typed lower than Major Highway (MH)