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Kitsap County Public Works
Department of Public Works
614 Division Street, Port Orchard, WA  MS-26
Phone:(360)337-5777 * Fax:(360)337-4867
 

    

 

 

 

 

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Level of Service (LOS)

Approach
Level of service (LOS) designations are qualitative measures of congestion that describe operational conditions within a traffic stream and take into consideration such factors as volume, speed, travel time, and delay. LOS is represented by letter grades, A through F. LOS A through C imply traffic flows with minimal delay, while LOS D and E imply conditions that approach capacity, and LOS F implies unstable flow with potential for substantial delays (Transportation Research Board 2000). Characteristics of the six LOS designations for roadway segments and intersections can be found in the Transportation section of the Capital Facilities Plan.

In General
A – Traffic flowing freely
B – Generally unimpeded traffic flow
C – Slower but stable flow with minor delays
D – Reduced speeds and increased delays
E – Slow speeds and significant delays
F – Stop and go traffic, High level of delay

Roadway Segment LOS
Kitsap County uses traditional engineering methodology to evaluate LOS of roadway segments, which are sections of roadway located between major intersections. Roadway travel volumes are compared to roadway capacity to develop a ratio known as volume-to-capacity (V/C). The volume-to-capacity ratios relate directly to measures of level of service.

This table shows the relationships between LOS, V/C ratios, and peak-hour free flow speed on a roadway segment:

  LOS

Volume to Capacity Ratio Range

Percent of Free Flow Speed (Peak Hour)

A

0.50 and below

90% or greater

B

0.60 to 0.69

70% to 90%

C

.70 to .79

50%

D

.80 to .89

40%

E

.90 to .99

33%

F

1.00 and above

25% or less

Intersection LOS
Kitsap County currently has LOS standards adopted only at the roadway segment level. However, in more urban parts of the County, it has been recognized that roadway operations may be controlled more by intersection operations than overall roadway segment operations. In these areas, the County has also been regularly measuring and analyzing intersection LOS. Intersection LOS is determined by the average amount of delay experienced by vehicles at the intersection.

This table summarizes the LOS criteria for signalized intersections:

LOS

Average Delay per Vehicle (seconds/vehicle)

A

≤ 10

B

> 10 – 20

C

> 20 – 35

D

> 35 – 55

E

> 55 – 80

F

> 80

For stop-controlled intersections, LOS depends on the amount of delay experienced by drivers on the stop-controlled approaches. The LOS criteria for stop-controlled intersections have different threshold values than the criteria for signalized intersections, primarily because drivers expect different levels of performance from distinct types of transportation facilities. In general, stop-controlled intersections are expected to carry lower volumes of traffic than signalized intersections. Thus, for the same LOS, a lower level of delay is acceptable at stop-controlled intersections than it is for signalized intersections

This table summarizes the LOS thresholds for stop-controlled intersections:

LOS

Average Delay per Vehicle (seconds/vehicle)

A

≤ 10

B

> 10 – 15

C

> 15 – 25

D

> 25 – 35

E

> 35 – 50

F

> 50

Tables listing existing and 2025 intersection LOS can be found in Volume II, section 3.2.6 of the County Comprehensive Plan FEIS

LOS Standards
LOS standards are used to evaluate the transportation impacts of long-term growth and concurrency. Jurisdictions must adopt standards by which the minimum acceptable roadway operating conditions are determined and deficiencies may be identified.

LOS standards for county arterials and state highways, located within Kitsap County, involve three different policy approaches established by Kitsap County, PSRC, and WSDOT. While somewhat diverse in application, all the standards and methodologies are consistent with the Highway Capacity Manual (Transportation Research Board 2000) definitions and procedures.

County Roadways
Kitsap County's LOS policy generally recognizes that urban areas are likely to have more congestion than rural areas. This reflects the different characteristics of land use and transportation in these areas. For purposes of defining LOS standards, urban areas are the geographic areas located within a UGA boundary, and rural areas are the geographic areas located outside of all UGA boundaries.

The LOS standards shown in the table below are based upon the location and functional classification of the roadway facilities to which they apply. Though the County’s goal is to have no LOS deficiencies, it is recognized that not all roadways will meet the standards all the time given the limits of county, state and federal funding and timing of project implementation. Therefore, 15 % of the lane miles tested for concurrency will be allowed to temporarily exceed LOS standards. This 15 % allowance shall be applied at both the system wide and project site level.

 

Functional Classification

Maximum V/C Ratio/LOS Standard

Urban1

Rural2

Principal Arterial

.89/D

.79/C

Minor Arterial

.89/D

.79/C

Collector

.89/D

.79/C

Minor Collector

.89/D

.79/C

Residential/Local

.79/C

.79/C

Tables listing existing and 2025 roadway LOS can be found in Appendix K, Volume II of the County Comprehensive Plan DEIS, along with a map of projected deficient roadways.

Roadway Deficiencies
  North Central South County-Wide

2006

  7.5 %  2.2 %   3.4 %     4.3 %

2025

15.2 %  7.0 % 24.8 %   16.4 %

Kitsap County Public Works
Kitsap 1
(360) 337-5777 or (800) 825-4940
Kitsap1@co.kitsap.wa.us

Updated:  June 25, 2010
 
 
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