Table C-1
Summary of Generalized Annual Average Daily Volumes for the
Phoenix Urban Area
I-10/Hassamyampa Valley Roadway Framework Study

FREEWAY
Interchange Spacing Less Than Two Miles
Number of
Level of Service
Through Lanes*
A
B
C
D
6
43,200
70,000
101,300
131,200
8
58,900
95,500
138,100
178,900
10
74,700
120,900
175,100
226,400
12
90,400
146,400
211,900
274,100
EXPRESSWAY
Number of
Through Lanes
4
6

E
149,100
203,200
257,500
311,500

B
41,900
62,700

Level of Service
C
D
60,500
78,300
90,700
117,500

E
88,900
133,500

PRINCIPAL ARTERIAL
Number of
Through Lanes
A
4
**
6
**

B
5,200
8,300

Level of Service
C
D
32,900
41,500
51,100
62,400

E
43,600
65,600

MINOR ARTERIAL
Number of
Through Lanes
4

A
**

B
5,200

Level of Service
C
D
32,900
41,500

E
43,600

COLLECTOR
Number of
Through Lanes
2

A
**

B
**

Level of Service
C
D
6,000
12,700

E
16,000

A
25,900
38,700

Bold Type indicates the planning level threshold standard for maximum acceptable daily volume by facility type.
* Excludes auxiliary lanes.
** Cannot be achieved using table input value defaults.
Note: This table does not constitute a standard and should be used for general planning applications,
only. The computer models from which this table is derived should be used for more specific planning
applications. The table and deriving computer models should not be used for corridor design, where more refined
techniques exist. Values are shown for two-way annual average daily volumes (based on K 100 factors) for levels
of service and are for automobile/truck modes. Calculations are based upon planning applications of the Highway
Capacity Manual, Transportation Research Board, Washington DC, 2000.
Source: Maricopa Association of Governments (MAG) and Wilson & Company (December 13, 2006). Modified
version of Table 4-1 (Urbanized Areas), Quality/Level of Service Handbook, Florida Department of Transportation,
2002. Modifications were made to reflect a lower K factor (0.075 vs 0.095) that is predominant in the Phoenix
area.