VITAL SIGNS INDICATOR Time Spent In Congestion (T7) FULL MEASURE NAME Congested delay on regional freeways LAST UPDATED May 2017 DESCRIPTION Time spent in traffic congestion – also known as congested delay – refers to the number of minutes weekday travelers spend in congested conditions in which freeway speeds drop below 35 mph. Total delay, a companion measure, includes both congested delay and all other delay in which speeds are below the posted speed limit. DATA SOURCE Metropolitan Transportation Commission/Iteris: Congested Corridor Analysis CONTACT INFORMATION vitalsigns.info@mtc.ca.gov METHODOLOGY NOTES (across all datasets for this indicator) Delay statistics only include freeway facilities and rely upon INRIX traffic data. They reflect delay on a typical weekday, which is defined as Tuesday through Thursday during peak traffic months. Delay statistics emphasize recurring delay - i.e. consistent delay greater than 15 minutes on a specific freeway segment. Congested delay is defined as congestion occurring with speeds less than 35 mph and is commonly recognized as inefficient delay (meaning that the freeway corridor is operating at speeds low enough to reduce throughput - as opposed to speeds greater than 35 mph which increase throughput). Data sources listed above were used to calculate per-capita and per-worker statistics; national datasets were used for metro comparisons and California datasets were used for the Bay Area. Top congested corridors are ranked by total vehicle hours of delay, meaning that the highlighted corridors reflect a combination of slow speeds and heavy traffic volumes. Historical Bay Area data was estimated by MTC Operations staff using a combination of internal datasets to develop an approximate trend back to 1998. The metropolitan area comparison was performed for the combined primary urbanized areas (San Francisco-Oakland and San Jose) as well as nine other major metropolitan areas' core urbanized area. Because the Texas Transportation Institute no longer reports congested freeway delay or total freeway delay (focusing solely on total regional delay), 2011 data was used to estimate 2014 total freeway delay for each metro area by relying upon the freeway-to-regional ratio from 2011. Estimated urbanized area workers were used for this analysis using the 2011 ratios, which accounts for slight differentials between Bay Area data points under the regional historical data and the metro comparison analysis. To explore how 2016 congestion trends compare to real-time congestion on the region’s freeways, visit 511.org.
This dataset has the following 17 columns:
Column Name | API Column Name | Data Type | Description | Sample Values |
---|---|---|---|---|
ID | id | text | US-101 I-580 I-880 I-680 I-280 view top 100 | |
Location | location | text | Extents of congested segment | At EB I-80 Connector At Redwood Road (Castro Valley) At SR-12 Merge Wilson Avenue/Sacramento Street to Lane Drop West of Mare Island Exit Cutting Boulevard to East End of Richmond-San Rafael Bridge view top 100 |
Year | year | number | 2016 view top 100 | |
Rank | rank | number | 2016 congestion ranking for segment | 154 58 137 141 146 view top 100 |
cs_rank | cs_rank | text | Unique rank (associated with shapefile) | 71 123 137c 8 75 view top 100 |
County1 | county1 | text | County where congested segment is located | Santa Clara County Alameda County San Mateo County Contra Costa County San Francisco County view top 100 |
County2 | county2 | text | County where congested segment is located | Alameda County Contra Costa County San Francisco County Sonoma County view top 100 |
County3 | county3 | text | County where congested segment is located | San Francisco County view top 100 |
Route1 | route1 | text | Freeway route number of congested segment | US-101 I-580 I-880 I-680 I-280 view top 100 |
Route2 | route2 | text | Freeway route number of congested segment | I-238 I-280 I-580 I-80 I-880 view top 100 |
Direction1 | direction1 | text | Direction (NB, SB, etc.) of corresponding freeway route number | NB SB WB EB view top 100 |
Direction2 | direction2 | text | Direction (NB, SB, etc.) of corresponding freeway route number | NB EB view top 100 |
Length | length | number | Mileage of congested segment | 0.99 1.45 0.21 5.29 2.60 view top 100 |
StartHour | starthour | calendar_date | Start hour of congestion | 1899-12-31T14:45:00.000 1899-12-31T07:00:00.000 1899-12-31T16:25:00.000 1899-12-31T14:50:00.000 1899-12-31T08:20:00.000 view top 100 |
EndHour | endhour | calendar_date | End hour of congestion | 1899-12-31T09:10:00.000 1899-12-31T18:15:00.000 1899-12-31T09:05:00.000 1899-12-31T18:55:00.000 1899-12-31T18:10:00.000 view top 100 |
VHD | vhd | number | Total daily congested vehicle-hours of delay on segment | 30 1 140 70 390 view top 100 |
Source | source | text | INRIX_2016 view top 100 |