Fig. 1 The p.m. peak period roadway level-of-service (LOS) in San Francisco (30). (A) 2009 conditions; (B) 2017 conditions. LOS grades roadways by vehicle delay, from LOS A representing free flow to LOS F representing bumper-to-bumper conditions. Data and an interactive mapping tool are available at congestion.sfcta.org.
Fig. 2 Daily TNC pickups and drop-offs for an average Wednesday in fall 2016 (1). Darker colors represent a higher density of TNC activity. Data and an interactive mapping tool are available at tncstoday.sfcta.org.
- Table 1 Estimated relationships between PTI80 and TTI.
Facility type γ1 γ2 R2 Freeways and expressways 1.029 1.498 0.831 Arterials 1.101 1.361 0.862 Collectors and locals 1.131 1.440 0.762 - Table 2 Fixed-effects panel estimation results with TNC variables.
Parameter estimates Variable Parameter Standard error T-statistic SF-CHAMP background volume 0.9172 0.0541 16.952 Presidio Parkway scaling factor −0.3648 0.0189 −19.327 TNC volume 0.6864 0.0720 9.5387 Average impact duration of TNC PUDO on major arterials (s) 144.75 7.7195 18.751 Average impact duration of TNC PUDO on minor arterials (s) 79.486 12.114 6.5617 Model statistics Number of entities 7081 Number of time periods 2 R2 between groups 0.5819 R2 within groups 0.2985 - Table 3 Network performance metrics.
Scenario Network performance metrics VMT Based on modeled travel time Based on observed travel time VHT VHD Average speed (mph) PTI80 VHT VHD Average speed (mph) PTI80 2010 4,923,449 205,391 64,863 24.0 1.83 204,686 64,158 24.1 1.83 2016 no TNC 5,280,836 230,642 79,449 22.9 1.94 N/A N/A N/A N/A 2016 with TNC 5,559,412 266,393 105,377 20.9 2.12 269,151 108,134 20.7 2.21 Scenario Percent change from 2010 VMT Based on modeled travel time Based on observed travel time VHT VHD Average speed (mph) PTI80 VHT VHD Average speed (mph) PTI80 2010 0% 0% 0% 0% 0% 0% 0% 0% 0% 2016 no TNC 7% 12% 22% −4% 6% N/A N/A N/A N/A 2016 with TNC 13% 30% 62% −13% 15% 31% 69% −14% 21%
Supplementary Materials
Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/5/5/eaau2670/DC1
Supplementary Text
Fig. S1. Area type map on SF-CHAMP links.
Table S1. Fixed-effects panel model estimation results only accounting for background traffic.
Table S2. Network performance metrics by TOD.
Table S3. Network performance metrics by area type.
Table S4. Network performance metrics by facility type.
Data S1. Supporting data for Fig. 1.
Data S2. Supporting data for Fig. 2.
Data S3. Model estimation files.
Data S4. Model application results and supporting data for Fig. 3.
Additional Files
Supplementary Materials
The PDF file includes:
- Supplementary Text
- Fig. S1. Area type map on SF-CHAMP links.
- Table S1. Fixed-effects panel model estimation results only accounting for background traffic.
- Table S2. Network performance metrics by TOD.
- Table S3. Network performance metrics by area type.
- Table S4. Network performance metrics by facility type.
- Legends for Data S1 to S4
Other Supplementary Material for this manuscript includes the following:
Files in this Data Supplement:
