Waymo — San Francisco, USA
Location
San Francisco, USA — urban intersection
San Francisco, intersection area
Description
Two Waymo robotaxis collided with each other in San Francisco, blocking all traffic at the location. After the collision, a third Waymo vehicle approaching from behind became stuck, unable to navigate around the two disabled vehicles. The result was three Waymo vehicles creating a complete traffic blockage. The incident raised questions about fleet-level coordination — whether vehicles from the same fleet should have shared awareness to prevent same-fleet collisions and cascading blockages. The incident went viral on social media as a symbol of robotaxi operational challenges.
Impact
Vehicles
3
Duration
45 min
Injuries
0
Fatalities
0
Traffic disruption: severe
Emergency Response
Resolution: manual towing of disabled vehicles; third vehicle remotely rerouted after delay
Root Cause
vehicle-to-vehicle coordination failure
Two vehicles from the same fleet collided, indicating no effective V2V awareness or fleet coordination; third vehicle's inability to navigate around the scene indicates path planning failure in degraded scenarios
⚠️ Unconfirmed / Under investigation
Systemic Issues
- Same-fleet vehicles lack V2V coordination to prevent mutual collisions
- Cascading blockage from third vehicle amplifies the incident
- Fleet-level situational awareness is absent
- Social media amplification of 'three Waymos blocking traffic' damaged brand perception
- Path planning cannot handle scenarios with disabled fleet vehicles blocking the route
Regulatory Action
CPUC requested briefing from Waymo on fleet coordination capabilities. No formal enforcement action taken.