Assertion: traffic light | /r/CapableOf | play key role
Facets:
value: for the overall safety of traffic
type: PURPOSE
value: for pedestrians
type: TRANSITIVE-OBJECT
Source sentences:
text: But beyond these terrible scenarios, we must accept that traffic lights are playing a key role, not only for the overall safety of traffic, but also for pedestrians who wish to cross a road without putting their lives at risk.