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require different standards of design and construction as the intended volumes
<br />and speeds of traffic increase or decrease. The Metropolitan Development
<br />Guide's chapter on transportation established the following functional classifi-
<br />cation system for roadways.
<br />
<br /> TABLE 7
<br />
<br />FUNCTIONAL CLASSIFICATION SYSTEM CHARACTERISTICS FOR ROADWAYS
<br />
<br />Principal Inlermedlate Minor
<br />Arlerial Arterial Arterial Collector Local
<br />
<br />Spacing 3-6 miles depending 1-3 miles depending 0.5-2.0 0.25-1.0
<br /> on trip density, lransit, on spacing o! princi- miles, miles.
<br /> minor arterial spacing, pal arlerials and minor
<br /> & Iocalion of existing arlerials, transit, trip
<br /> facilities, density, and location
<br /> of existing facilities.
<br />Location In nalural community In nalural community On edges of On edges or
<br /> separations defining separations defining development within
<br /> developmenl and nol developments and not and neighbor- neighborhoods.
<br /> separaling it. separating it. hoods.
<br />
<br />.Land Access
<br /> Urbar~
<br /> Rural
<br />
<br />Intersection
<br />Characlerisfics
<br />
<br />Parking
<br />
<br />Large trucks
<br />
<br />Managemenl tools
<br />
<br />Syslem Mileage
<br />
<br />1 block
<br />
<br />Per cent of Travel
<br />
<br />Within neigh-
<br />borhoods and
<br />other homo-
<br />genous land
<br />use areas.
<br />Direct
<br />access.
<br />Direcl land
<br />access.
<br />
<br />None. Major traffic Limiled direct Some limitalion on
<br /> generators, land access, direct land access.
<br />None. Freeslanding Growth Commercial, Access Io
<br /> Centers and Rural induslrial, and high- agricullural
<br /> Town Cenlers. density residential uses with
<br /> uses. No acce.r:~c~to limits on
<br /> ~. single family use'. Iow-density
<br /> residential.
<br />Grade separated Grade separated or Traffic sig- 4-way stops
<br />(urban} or high high-capacity con- hals and and some
<br />capacily controlled trolled al-grade cross slreet traffic sig-
<br />al grade inter- inlerseclions, stops, halS. Loop
<br />sections Jrural). street stops.
<br />None. None. Restricted Restricled
<br /> as necessary, as necessary.
<br />No restriction. No restriction. Restricled as Restricted as
<br /> necessary, necessary
<br />Ramp metering, Ramp metering, traffic Traffic signal Continuity. number of
<br />lraflic signal timing, signal timing, staging timing, land access lanes, traffic signal
<br />no land access, of reconstruction, land spacing, preterenlial timing, land access.
<br />preferential trealmen.1 access spacing, treatment for transit.
<br />Ior transit.
<br />inlerchange spacing..
<br />Suggested federal upper limils for principal Suggested federal Suggested federal Suggested lederaJ
<br />arterials and intermediate arterials combined: 'limilations lot limitations: Urban limitations: Urban
<br />Urban 10 per cent principal arterials. 5-10%. Rural 20-35% 65-80%. Rural 63-75%
<br />Rural 4 per cent intermediate arleriats.
<br /> and minor arterials
<br /> combined: Urban
<br /> 15-25%. Rural 6-12%
<br />
<br />Suggested fe~leral limitations for principal
<br />&rterb3ls and intermediate arterials combned:
<br /> 40-65 per cent
<br />
<br />10,O00-50,000
<br />2,500-25,O00
<br />
<br />3~- 50
<br />Lega~ limit
<br />100'-300'
<br />PreferentiAl treatment
<br />where needed;
<br />bus stops separated
<br />from through traffic
<br />laneS.
<br />
<br />-37-
<br />
<br />Vehicles carded Urban 20,O00-'tO0,OO0
<br /> Rural 5,000-50,000
<br />
<br />Posted Urban 45-55 -
<br />speed limit Rurar Legal limil
<br />Right-of-way 300'
<br />Transit Prority to high
<br />Accommodations occupancy vehicles
<br /> and transit in peak
<br /> periods,
<br />
<br />As required.
<br />
<br />Unrestricted.
<br />
<br />Permitted as
<br />necessary.
<br />Stop signs,
<br />cut-de-sacs.
<br />diverters.
<br />
<br />Suggested federal Suggesled limitations: Suggesled federal
<br />limitations for 5-10% limilalions: 10-30%
<br />principal arlerials,
<br />intermediate aderials.
<br />and minor arterials
<br />combined: 65-80%
<br />5,000-30,000 1,000-15.000 1.000
<br />1,000-10,000 250-2,500 1,000
<br />
<br />35-45 30-40 Maximum 30
<br />Legal limit 35-45 Maximum 30
<br />66'- 150' 66'- 100' 50'-80'
<br />Preferential treatment Pavemenl, in- Normally used
<br />where needed in lerseclions, as regional bus roules
<br />activity centers; and bus stops only in non-
<br />bus pullouts where designed for residential areas;
<br />required based use by regul~" used as required or
<br />on percentage transit buses, specialized transit
<br />and traffic volumes, service wilh sm¢lef
<br /> vehicles in
<br /> residentiaJ areas.
<br />
<br />
<br />
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