At the December 2, 2021 Infrastructure Committee meeting, Dean Hsiao gave a presentation [PDF] on the Leading Pedestrian Interval (LPI) project in Downtown Oakland. The red dots on map below are traffic signals that are going to updated with LPI, and green dots are ones that can not be updated due to older technology. Notes from the presentation and discussion are below.
- “Leading pedestrian interval” (LPI) — a walk light is provided a few seconds in advance of the green light for cars
- Studies show it can reduce car/pedestrian collisions up to 60%.
- 85 signals in the Downtown area being updated.
- 36 signals completed (northern half of Downtown)
- 49 remaining, to start in December (southern half of Downtown)
- Other locations in Downtown need to have signal controller tech updates to allow for retiming, or to add pedestrian walk signal heads.
- Red dots on map are signals that can be updated, green dots are ones that can not be updated without expensive signal upgrades firs. t
- Can “No Right On Red” be implemented, so pedestrians are also protected from turning cars during their early crossing phase?
- Possibly, though this would be implemented separate from this signal adjustment project.
- Is a gap provided between when the cross street goes red and when the walk light comes on? (“red clearance”)
- Some signals in this project already have such a gap programmed, but others do not—These were not adjusted so in some cases the walk light does come on immediately after the cross street goes red.
- Concerns expressed about danger from late-arriving drivers crossing after the red, in conflict with pedestrians entering intersection. Recommend always providing a “red clearance” gap when LPI is implemented.
- Staff will look into this.
- How can other signals be upgraded to allow for more LPIs?
- Grant funding is typically used to upgrade signals, or sometimes via development projects.
- Are any Caltrans signals included?
- No, City-owned signals only.
- Are LPI signal upgrades incompatible with transit signal upgrades?
- No, they can work together—The entire signal length is the same, drivers just have a few seconds less to cross.
- BPAC is interested in receiving opportunities for feedback on future signal adjustment projects ahead of implementation. Staff should communicate and schedule items proactively going forward.