New Hampshire/Major roads/Main

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

• Map of the three state 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	4
Minor Highway	3
Primary Street	1 (Auto)
Street	1 (Auto)
Private Road	1 (Auto)
• • • • Ferry • • • •	5
|-|-|-|-|-|-|-|-|-| Railroad |-|-|-|-|-|-|-|-|-|	2

Note: Do Not Mass Edit just to update locks to these standards, these can be adjusted as you find them 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 determines road types using Federal Functional Classification (FC) across the entire state.

State Functional Classification Resource

• NHDOT District FC Maps (See District Map to know which FC map to get) - Scroll down to "Roads By Function" and then click on the appropriate RPC Map.
  

Functional Classification to Waze Conversion Table

Note that NHDOT has a separate classification scheme (sometimes called "Legislative Class") that sometimes appears as Roman numerals. They do NOT equate to the Federal Classification numbers below.

The numbers correspond to the Functional Classification 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, LOOP	Locally-maintained
	example>>>>>	I-95 N	US-2	SR-27 (SR-27A)	SR-400 Loop	Robertson St
F u n c t i o n a l C l a s s	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)