2003 Annual Traffic Report Washington State Department of Transportation In cooperation with the United States Department of Transportation Federal Highway Administration CONTENTS INTRODUCTION …………………….………………………………………………………..……………………………. I THIS YEAR’S FEATURED ITEM …………………………………...………………………………..…………………… II AUTOMATED DATA COLLECTION (ADC) Station Locations and Descriptions ………………………………………………………...……………...……… III Station Listing by Location ………………………………………………………..………….……………...………… VI ADC Site Location Maps …………………………………………………………..………………………..………… VIII ADC Annual Data Summary - Rural Stations ………………………………………………………………..…… X ADC Annual Data Summary - Urban Stations ………………………………………………………………..…… XVIII Annual Average Daily Traffic (AADT) Volumes - Rural Stations - 1994 – 2003 …………………..….………. XXIII Annual Average Daily Traffic (AADT) Volumes - Urban Stations - 1994 – 2003 ……………………...………. XXXI The Expansion of Short-Duration Count Data to AADTs ………………..…………………………………..… XXXVI Conversion Factors – Average Weekday Traffic (AWDT) to AADT - Rural Stations – 2003 ……....….…… XXXVII Conversion Factors – Average Weekday Traffic (AWDT) to AADT - Urban Stations – 2003 ………....…... XLI FERRY SYSTEMS AND TOLL CROSSINGS Ferry Systems Operated in Washington State - 1994 – 2003 ………….……………………..………………..… XLIV Toll Crossings of the Columbia River - 1994 – 2003 ……………………….………………………………..…….. XLIV ANNUAL VEHICLE MILES OF TRAVEL (AVMT) AVMT Definition and Trends ………………………….……………………………………..………………..……… XLV State Route AVMT Summary by County - 2003 ………………………………………………………………..…… XLVI ANNUAL AVERAGE DAILY TRAFFIC VOLUMES ………..……………………………………………………...…… 1 COUPLET SKETCHES ……………………….………….………………………………………………………..………… 152 2003 WASHINGTON STATE TRAFFIC FLOW MAP .…………………………………………………………..……… 173 INTRODUCTION The Washington State Department of Transportation is responsible for the sufficient data was collected in 2003. Also included on the back inside cover of this administration of approximately 7,000 miles of roadway involving large annual report is a copy of the 2003 Washington State Traffic Flow Map. expenditures for planning, design, construction, and maintenance. This requires having reliable and current traffic volume information, vehicle type classification T R I P S (TR ansportation I nformation and P lanning S upport System) information, and travel statistics throughout the state. Data collected by the Washington State Department of Transportation to meet these needs are provided in The roadway information contained within this report is presented using the coding this report at a summary level. scheme employed by the TRIPS mainframe computer system. This system is used by the Transportation Data Office to store, maintain and report information about the Report Contents State Highway system. Within TRIPS, each State Route is uniquely identified using a Related Roadway Type and Qualifier. Related Roadway Types are: The Annual Traffic Report contains Annual Average Daily Traffic (AADT) volumes for the years 2000 through 2003. The AADT volumes are included only at locations Blank = Mainline AR = Alternate Route where actual traffic counts have been conducted in one or more of the last four years. CO = Couplet RL = Reversible Lane An asterisk or plus sign placed beside a traffic volume signifies that the AADT was SP = Spur HI = Grade Separated HOV Lane -Increasing derived from a traffic count conducted during the year for which the AADT is provided. HD = Grade Separated HOV Lane -Decreasing All other volumes shown in this report are estimates based on traffic counts conducted in prior years and factored to an AADT using patterns from Automated Related Roadway Qualifiers further describe Related Roadway Types. For example: Data Collection (ADC) Stations. Blanks in the traffic volume portion indicate that no 155SPOMAK describes a spur in Omak on State Route 155. Related Roadway traffic volume data is available. Types are listed at the end of the State Route. Note that because estimated AADTs are sometimes revised for accuracy as new data Traffic volumes at mainline State Route locations with couplets are identified by a “C” becomes available, previous years’ traffic volumes provided in this report may not printed under the column heading “COUPLET”. In most cases traffic volumes at always reflect those found in previous publications. these locations, as well as on the couplets themselves, represent a single direction of travel. Couplet sketches are included in the back of the report. This report also provides truck percentages derived from data collected at ADC Stations. This information is based on from nine to twelve months of data (depending The state functional class of the highway is listed at each location. Functional classes on availability), and represents estimated annual percentages for the locations they are: are provided for. Truck percentages are separated in to three types: single, double, and triple units. Single units consist of two- and three-axle trucks and buses. Double 1 = Principal Arterial 3 = Collector units consist of trucks with a trailer. Triple units consist of trucks with trailer 2 = Minor Arterial 5 = Interstate combinations. The total truck percentage will not always match the sum of each truck type since percentages are stored electronically rounded to the nearest hundredth, The leg identification for traffic volume data is found in the location’s description. At but provided in this report rounded to the nearest whole percent. intersections the leg is defined as before or after, based on the increasing direction of mileposts. This publication reflects the state highway system as it existed as of Traffic volume and truck percentage data for design purposes should be December 2003. obtained through specific traffic analysis requests directed to the Analysis Branch of the Transportation Data Office, at (360) 570-2416. For other traffic- Americans With Disabilities Act (ADA) Information related inquires, please contact the Highway Usage Branch, at (360) 570-2381. Persons with disabilities may request this information be prepared and supplied in Additional Contents alternate formats by calling the Washington State Department of Transportation at (360) 705-7097. Persons that are deaf or are hard of hearing may access the A list of ADC Stations and maps of their locations are included in the foreword of this Washington State Telecommunications Relay Service at 7-1-1, and ask to be report. Also provided is a summary of 2003 data from these traffic recorders, as well connected to (360) 705-7097. as a ten-year history of AADTs for ADC sites, Ferry Systems, and Toll Crossings. Data from these are used in the calculation of seasonal traffic variations and in the estimation of AADTs from mechanical counts of 48 or 72 hours in duration. Integral to Roger Horton performing these estimations is the use of Average Weekday to Annual Average Daily General Manager Traffic conversion factors, which are included for ADC locations where Transportation Data Office I ANNUAL FEATURED ANALYSIS What time of day do large trucks, those towing one or more trailers, travel on our state highways? The charts on this page depict hourly traffic fluctuations at Typical 24-Hour Traffic Volume Distribution representative rural locations on three primary highways used for moving freight I-82 West of Exit 122 (South of Tri-Cities) within Washington State. The charts compare the traffic volumes of large 1200 trucks and other vehicles during weekday (Tuesday through Thursday) and weekend (Saturday and Sunday) conditions. Each chart is based on April 2003 1000 data, with this month being chosen for analysis purposes because traffic volumes in April tend to provide particularly good representations of annual 800 averages. 600 The charts indicate that while other types of traffic are considerably reduced Volume during the late hours of the night, large truck traffic continues much less abated. 400 This is due to the long distances that are often traveled and because long-haul 200 truckers have economic incentives to drive during the least congested periods of the day. Additionally, the interconnection between trucking and the other 0 components of the nation’s system for distributing goods, such as rail and 24681012141618202224 shipping, frequently require cargo to be picked up and delivered at times that do Hour not fall within a typical workday. Although not shown, urban locations tend to display similarly modest changes in large truck volume over the course of the Large Trucks (Weekday) Other Vehicles (Weekday) day. However, the higher proportion of local truck traffic in urban areas can Large Trucks (Weekend) Other Vehicles (Weekend) result in subtly different curves than those displayed for rural roadways. Typical 24-Hour Traffic Volume Distribution Typical 24-Hour Traffic Volume Distribution I-90 West of Exit 84 (Near Cle Elum) I-5 North of Exit 260 (Near Ferndale) 3000 4000 2500 3500 3000 2000 2500 1500 2000 Volume Volume 1000 1500 1000 500 500 0 0 2 4 6 8 10 12 14 16 18 20 22 24 24681012141618202224 Hour Hour Large Trucks (Weekday) Other Vehicles (Weekday) Large Trucks (Weekday) Other Vehicles (Weekday) Large Trucks (Weekend) Other Vehicles (Weekend) Large Trucks (Weekend) Other Vehicles (Weekend) II AUTOMATED DATA COLLECTION STATION LOCATIONS AND DESCRIPTIONS BY SITE RURAL SITES RURAL SITES ADC SR MILE RELATED LOCATION DESCRIPTION ADC SR MILE RELATED LOCATION DESCRIPTION SITE POST ROADWAY SITE POST ROADWAY TYPE TYPE B02 12 12.30 W/O MONTE BRADY LOOP ROAD WYE CONN P33 290