Route Links:

• Printable weekday data (pdf 227kb)
• Printable weekend data (pdf 224kb)

Average weekend data

Corridor Performance:

• This is one of the most heavily traveled corridors in the region. Toward the southern end of the corridor traffic shows a stronger orientation to the peak direction. Closer to Seattle, traffic volumes are high in both directions throughout daytime hours. The general purpose lanes experience significant slowing during the peak periods both northbound and southbound. PM peak period traffic congestion is a routine occurrence going up the Southcenter Hill. After 7:00 PM traffic volumes decrease to about 1,000 vehicles per lane per hour and speeds increase to near the posted speed limit.

• In the morning peak period the northbound HOV lane experiences significant congestion approaching downtown Seattle and frequently fails to meet the state performance standard. Outside of peak hours the HOV lanes operate with a high level of speed and reliability. HOV lane person throughput is approximately double the general purpose lane throughput in the peak direction during peak periods. At the northern end of the corridor HOV lane person throughput is comparable to average general purpose lane throughput during the midday. Toward the southern end of the corridor midday HOV volumes are somewhat lower.

• King County Metro and Sound Transit provide a high level of transit service in the corridor. Service is strongly oriented to the peak direction and is more intense during peak commute hours. Transit passengers account for a large share of peak period HOV users.