General Plan Update Review Committee Draft Elements Part 2 For ...

Existing conditions for roadway segment levels of
service were estimated utilizing average daily traffic
(ADT) and then evaluated based on LOS thresholds;
see Table 4-2.
Table 4-2: Level of Service Criteria for Roadway Segments
Roadway Segment Type
Total Two-way Average Daily Traffic (ADT)
LOS A LOS B LOS C LOS D LOS E
6-Lane Divided Freeway 42,000 64,800 92,400 111,600 120,000
4-Lane Divided Freeway 28,000 43,200 61,600 74,400 80,000
6-Lane Freeway 36,900 61,100 85,300 103,600 115,300
4-Lane Freeway 23,800 39,600 55,200 67,100 74,600
6-lane Divided Expressway (with left-turn lanes) 35,500 42,200 46,200 55,800 60,000
6-Lane Divided Arterial (with left-turn lane) 32,000 38,000 43,000 49,000 54,000
4-Lane Divided Arterial (with left-turn lane) 22,000 25,000 29,000 32,500 36,000
4-Lane Undivided Arterial (no left-turn lane) 18,000 21,000 24,000 27,000 30,000
2-Lane Arterial (with left-turn lane) 11,000 12,500 14,500 16,000 18,000
2-Lane Arterial (no left-turn lane) 9,000 10,500 12,000 13,500 15,000
2-Lane Collector/Local Street 6,000 7,500 9,000 10,500 12,000
Note: All volumes are approximate and assume ideal roadway characteristics. Actual threshold volumes for each Level of Service listed above may
vary depending on a variety of factors including curvature and grade, intersection or interchange spacing, driveway spacing, percentage of trucks
and other heavy vehicles, travel lane widths, signal timing characteristics, on-street parking, volume of cross traffic and pedestrians, etc.
Source: Based on “Highway Capacity Manual,” Transportation Research Board, 2000.
DRAFT ELEMENTS
For General Plan Update Review Committee
AUGUST 2012
4-7