HOV Corridor Vehicle Volume Profiles (peak period only)

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How and Where HOV Corridor Vehicle Volume Profiles Were Measured

To investigate the effectiveness of the HOV system, variations in vehicle volumes were observed along the length of the region’s HOV corridors. The average annual weekday peak period HOV lane volumes were analyzed for either the AM (6:00 to 9:00 AM) or PM (3:00 to 7:00 PM) peak periods. HOV lane volumes were measured for all HOV corridors in the region, except the I-5 Express lanes.  Volume statistics were calculated for all locations for which sufficient data were available to make a reliable estimate.

How to Read the HOV Vehicle Volume Profiles

These graphs show a series of bars that illustrate the size of the vehicle volume carried in the HOV lane at various points along each freeway corridor.  The graphic illustrates how HOV lane volumes fluctuate geographically.  Each chart shows volumes along both directions of travel for either the 3-hour AM peak period (6:00 to 9:00 AM), or the 4-hour PM peak period (3:00 to 7:00 PM).

In general, HOV volumes increase when the lanes are closer to dense employment centers and decrease on the suburban ends of HOV facilities. Lower usage rates are also expected at the endpoints of HOV facilities where HOV traffic merges with GP traffic.  Like general purpose traffic, most corridors also have strong directional movements.  For example, HOV lane volumes on I-5 in the northern portion of the region are high inbound towards Seattle in morning and low outbound from Seattle.  In the evening, the reverse is true.

The low HOV volumes on I-90 are largely due to the combination of having two lanes of travel and lower congestion levels on I-90.  On SR 520 west of the I-405 interchange, volumes are low because of a more restrictive 3+ occupancy requirement.

Average Volumes:

Disclaimer. The contents of this Web page reflect the views of the authors/researchers, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Washington State Transportation Commission, Department of Transportation, or the Federal Highway Administration. The information presented does not constitute a standard, specification, or regulation.

Revised 22-Mar-2010