Continuity mistake: Henry talks about Eureka installing it's first traffic light but there has always been a traffic light in Eureka.
Suggested correction: The episodes in the first season were aired out of order. The previous episode that showed the traffic light was produced after "Blink."
The light is in every episode including the first one.
Then I would suggest trying to submit a screen shot because I never saw the traffic light on Main and Archimedes in the first episode.