§Objective:
□Identify realistic
operational conditions that span the likely range of congestion, incidents, and weather
that would be seen in a typical one year period at the site
§Approach:
□Examined one year (2012)
of travel time, incident, and weather logs for US 101
▪Determined that
southbound congestion is infrequent, so ruled out SB
▪Ruled out incident types
that have negligible effects on congestion (e.g. shoulder stalls,
etc.)
▪Ruled out incident,
weather combinations that occurred < 1% of days in 2012
▪Ruled out uncongested
time periods and days (weekends, holidays, off-peak)
▪Selected 4 hour PM peak
NB as regularly producing recurring congestion
□Identified six
operational conditions using remaining 251 days:
▪1. Dry Weather, No
recorded incidents likely to block one or more lanes (79%)
▪2. Dry Weather, Incident
blocking one lane for 30 minutes (7%)
▪3. Dry Weather, Incident
blocking one lane for 60 minutes (4%)
▪4. Rain, no recorded
incidents likely to block one or more lanes (8%)
▪5. Rain, Incident
blocking one lane for 30 minutes (1%)
▪6. Rain, Incident
blocking one lane for 60 minutes (1%)
▪