State Secondary?

[ColossalBlocks]

I was wondering if Missouri is the only state in the union to use letters like M,T,A,H, and D for the state secondaries? Does anyone know of other states that do the same as Missouri?

(state secondary roads, NOT county roads)

[txstateends]

I don't think there are any other lettered roads (besides WI's county roads); most states only use numbers for their routes--secondary or otherwise.  The occasional A after a number (usually meaning ALT) or B (usually meaning BUS or business), would be some rare lettering exceptions.

[dgolub]

Long Island uses letters for its parkways.  For example, N for the Northern Parkway, M for the Meadowbrook Parkway, W for the Wantagh Parkway.  They're not secondary routes, though--they're actually more primary than other state routes.  This is specific to Long Island, though, and doesn't exist in other parts of New York State.

[steviep24]

Would all those suffixed routes and reference routes NY has count?

[hotdogPi]

Would all those suffixed routes and reference routes NY has count?

He's referring to just letters. New York's suffixed routes and referenced routes have both a number and a letter.

[dgolub]

Would all those suffixed routes and reference routes NY has count?

He's referring to just letters. New York's suffixed routes and referenced routes have both a number and a letter.

Reference routes are all three-digit numbers with letter suffixes.  They all begin with a 9.

[vdeane]

And NY's other suffixed routes aren't secondaries; they're primaries.  That said, we do use all those letters (except T) on our suffixed routes.

While the Long Island parkways do have letters on the shields, those are abbreviations, not designations.

[Max Rockatansky]

I guess the Lettered County Route program would serve a similar purpose to a secondary road system.  The main exceptions would be that the routes are obviously country maintained.  Worse the variance in said signage varies greatly from county to county.  There are some decent ones like CA 59 becoming J59 and CA 132 becoming J132.

[SidS1045]

While the Long Island parkways do have letters on the shields, those are abbreviations, not designations.

Bethpage State Parkway:  NY 907E
Heckscher State Parkway:  NY 908M
Loop Parkway:  NY 908C
Meadowbrook State Parkway:  NY 908E
Northern State Parkway:  NY 908G
Ocean Parkway:  NY 909D
Robert Moses Causeway:  NY 908J
Sagtikos State Parkway:  NY 908K (southern half)
Southern State Parkway:  NY 908M
Sunken Meadow State Parkway:  NY 908K (northern half)
Wantagh State Parkway:  NY 908T

All unsigned reference routes; no signage with these designations except on reference markers.

[kurumi]

Apparently Iowa used letters alone (like WI, MO) until switching to the current alphanumeric county route system circa 1969: http://www.iowahighways.org/highways/countyrd.html

[vdeane]

While the Long Island parkways do have letters on the shields, those are abbreviations, not designations.

Bethpage State Parkway:  NY 907E
Heckscher State Parkway:  NY 908M
Loop Parkway:  NY 908C
Meadowbrook State Parkway:  NY 908E
Northern State Parkway:  NY 908G
Ocean Parkway:  NY 909D
Robert Moses Causeway:  NY 908J
Sagtikos State Parkway:  NY 908K (southern half)
Southern State Parkway:  NY 908M
Sunken Meadow State Parkway:  NY 908K (northern half)
Wantagh State Parkway:  NY 908T

All unsigned reference routes; no signage with these designations except on reference markers.

dgolub's initial post on parkways was referring to the letter in the shield, not the letter suffix for the reference route number (which is just an internal inventory number for stuff that doesn't make sense to give a route number).

[dvferyance]

I don't think there are any other lettered roads (besides WI's county roads); most states only use numbers for their routes--secondary or otherwise.  The occasional A after a number (usually meaning ALT) or B (usually meaning BUS or business), would be some rare lettering exceptions.

County roads are secondary roads. Aside from being maintained by a different government agency there really isn't any difference between the two.