traffic light
Red is the standard stop signal. This topic is part of Transportation within Technology. This page currently draws on 4 supporting questions, with answers and bonus facts available below.
traffic light trivia questions
A traffic light uses red to mean what?
Answer: Stop
Bonus fact: Red is the standard stop signal.
What color normally means proceed if the intersection is clear?
Answer: Green
Bonus fact: Green indicates traffic may move.
Who patented an early three-position traffic signal in 1923?
Answer: Garrett Morgan
Bonus fact: Morgan's design included an intermediate warning position.
At which FIFA World Cup were yellow and red cards introduced?
Answer: Mexico 1970
Bonus fact: The card system was inspired by traffic lights after referee communication problems at the 1966 World Cup.