WONDER #1768: Why Does Green Mean Go?

Question 1 of 3

Our modern system of color-coded traffic signals can be traced back to which transportation industry?

1. railroad
2. automobile
3. airplane
4. boat

Question 2 of 3

Originally, green was the color used to mean what?

1. stop
2. go
3. caution
4. proceed

Question 3 of 3

Which color did railroads originally use to mean go?

1. red
2. white
3. green
4. purple

Check your answers online at https://wonderopolis.org/index.php/wonder/why-does-green-mean-go.