Local Collector: Posted or proposed speed limit. Posted or proposed speed limit, minimum 25 mph. Local Road: Very Low Volume Local Road: Posted or proposed speed limit, minimum 20 mph. 2.4 Design Volumes The design volume is the traffic volume used in the design of a facility, representing the traffic expected to use the facility. Local road sub-collector, local road minor, and local road cul-de-sac shall be designed using estimated Average Daily Traffic (ADT) projections. These projections shall be for a given time period (in whole days), greater than one day but less than one year, divided by the number of days in that time period. For roadways with functional classifications of principal arterial, minor arterial, or collector, the Design Hourly Volume (DHV) concept is used. This is the 30th highest hourly volume of the future year chosen for design. For design purposes rural road or arterial DHV shall be 15 percent of ADT. For urban areas, DHV is 10 percent of the ADT. The County shall provide these design volumes to the Project Engineer upon request. For the purpose of these Standards, public roadways with an ADT of less than or equal to 400 are considered Very Low Volume Local Roads. 2.5 Design Year All roadways shall be designed to traffic volumes at the time of full build-out of the development. A reasonable yearly growth rate shall be applied to background traffic. The county engineer shall determine the growth rate used in the calculation. 2.6 Stormwater Management All roadways shall have adequate crown or cross-slope for water to run off the roadway. All stormwater management elements of the roadway within the project boundaries shall be designed in accordance with the requirements of Kitsap County Code Title 12, Stormwater Drainage. Low impact development (LID) techniques are required to the extent feasible without causing flooding or erosion impacts. See the Kitsap County Stormwater Design Manual for the applicable stormwater management and LID requirements, and the Kitsap County Green Streets Plan for additional LID guidance.
Local Collector: Posted or proposed speed limit. Local Road: Posted or proposed speed limit, minimum 25 mph. Very Low Volume Local Road: Posted or proposed speed limit, minimum 20 mph. 2.4 Design Volumes The design volume is the traffic volume used in the design of a facility, representing the traffic expected to use the facility. Local road sub-collector, local road minor, and local road cul-de-sac shall be designed using estimated Average Daily Traffic (ADT) projections. These projections shall be for a given time period (in whole days), greater than one day but less than one year, divided by the number of days in that time period. For roadways with functional classifications of principal arterial, minor arterial, or collector, the Design Hourly Volume (DHV) concept is used. This is the 30th highest hourly volume of the future year chosen for design. For design purposes rural road or arterial DHV shall be 15 percent of ADT. For urban areas, DHV is 10 percent of the ADT. The County shall provide these design volumes to the Project Engineer upon request. For the purpose of these Standards, public roadways with an ADT of less than or equal to 400 are considered Very Low Volume Local Roads. 2.5 Design Year All roadways shall be designed to traffic volumes at the time of full build-out of the development. A reasonable yearly growth rate shall be applied to background traffic. The county engineer shall determine the growth rate used in the calculation. 2.6 Stormwater Management All roadways shall have adequate crown or cross-slope for water to run off the roadway. All stormwater management elements of the roadway within the project boundaries shall be designed in accordance with the requirements of Kitsap County Code Title 12, Stormwater Drainage. Low impact development (LID) techniques are required to the extent feasible without causing flooding or erosion impacts. See the Kitsap County Stormwater Design Manual for the applicable stormwater management and LID requirements, and the Kitsap County Green Streets Plan for additional LID guidance.
Road%20Standards%20clean%20draft%20dated%203-22-2017.docx