Re: a few road map data questions
- From: Chris Bessert <bessert1@xxxxxxx>
- Date: Sat, 22 Apr 2006 15:36:51 -0400
romeoskiss4u@xxxxxxxxxxx wrote:
Where can I find U.S or individual state maps that highlight roads
according to the following criteria:
by value of commodities carried by trucks
Not sure if I've ever seen a map like this. Not that they don't exist,
but I've seen many a map in my lifetime and I cannot ever recall seeing
one like this.
annual average daily truck traffic
Many state DOTs would have this type of map, some are even online.
For example, here are Michigan's 2004 Commercial ADT Maps:
http://www.michigan.gov/mdot/1,1607,7-151-9622_11033_11149-30009--,00.html
category (trunk/regional freight/regional access/feeder/other)
All public roads in the US are (supposed to be) classified by their
function into what's called the "National Functional Classification.
From MDOT's website, here's their quick definition:
"National Functional Classification is a transportation planning
tool. All public roads are classified according to function --
this allows roads to be studied and compared across different
regions of the state or the entire country. National Functional
Classification is also used to determine which roads are eligible
to receive federal funds (federal-aid) for improvements. National
Functional Classification may be abbreviated as NFC."
Additionally, from the MDOT website:
"National Functional Classification (NFC) is a planning tool
which federal, state and local transportation agencies have used
since the late 1960's. The Federal Highway Administration (FHWA)
developed this system of classifying all streets, roads and high-
ways according to their function. The FHWA publication, Highway
Functional Classification: Concepts, Criteria and Procedures,
provides the basis for much of the following information.
"Principal arterials are at the top of the NFC hierarchical sys-
tem. Principal arterials generally carry long distance, through-
travel movements. They also provide access to important traffic
generators, such as major airports or regional shopping centers.
EXAMPLES: Interstate and other freeways; other state routes be-
tween large cities; important surface streets in large cities.
"Minor arterials are similar in function to principal arterials,
except they carry trips of shorter distance and to lesser traffic
generators.
EXAMPLES: State routes between smaller cities; surface streets of
medium importance in large cities; important surface streets in
smaller cities.
"Collectors tend to provide more access to property than do
arterials. Collectors also funnel traffic from residential or
rural areas to arterials.
EXAMPLES: County, farm-to-market roads; various connecting
streets in large and small cities.
"Local roads primarily provide access to property.
EXAMPLES: Residential streets; lightly-traveled county roads."
Each of the above categories is further refined into "URBAN" versus
"RURAL," so you can have an URBAN LOCAL ROAD and a RURAL LOCAL ROAD.
The Urban/Rural break occurs at the defined Federal Aid Urban Boundary
which is defined by the state DOTs and the FHWA.
Michigan has maps showing the NFC for all public roads on their
website and I know other states do as well. Some, however, do not
and it might be like pulling teeth to get to something like that
in some places.
whether they're federal/state/county managed roads
Just like your other question, there are likely 51 answers to this
question (50 states, 1 district, not counting territories). Some state
DOTs produce maps which break down every public street into jurisdic-
tional classification, others are less organized.
Here in Michigan, there are six main classifications of roadways
spread across three main jurisdictions (state/county/municipal):
1 - State Trunkline
2 - County Primary Road
3 - County Local Road (formerly township roads until the 1930s)
4 - City Major Streets
5 - City Minor Streets
7 - Unclassified/To-Be-Classified Roads
9 - Private/Non-Public Roads
Mind you, there is little connection between the jurisdiction (above)
and the National Functional Classification (NFC). Also, keep in mind
this is one example out of 51 and they DO vary widely from state to
state.
total U.S road length divided by who manages them (federal, state,
county, forestry, etc)
I'm sure the USDOT and/or FHWA has this kind of information, but I
don't know how timely or up-to-date it would be. I'm sure you could
call/e-mail each state DOT or visit their website and get much of this
type of information, but be forewarned: each state likely gathers and
reports this kind of information differently. Some might lump roads
in national forests, national parks, Indian reservations and military
bases as "federal," while others will categorize them differently. Also
note that it's apples and oranges when comparing between states, as
some states don't have county roads, while others don't have municipal
roads, and some have all types.
For Michigan, here's a breakdown that sounds a lot like the kind of
information you're looking for:
http://www.michiganhighways.org/introduction.html
A less-detailed page from my Wisconsin website:
http://www.wisconsinhighways.org/introduction.html
Maps showing roads by jurisdiction are available from some state
DOTs and in some states, county road departments also put out maps
showing the state/county/local jurisdiction of the roads in that
county (sometimes free!).
Later,
Chris
--
Chris Bessert
Bessert1@xxxxxxx
http://www.michiganhighways.org
http://www.wisconsinhighways.org
http://www.ontariohighways.org
.
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