Move the events of the story into chronological order. I went to the new amusement park.
I told my friends about the scary ride.
1 I rode the double-loop roller coaster

The sentence needs a descriptor of exactly "what" will happen at gurley and marina. in this case, it is the light at the intersection turning green. in this case, the sentence could be rewritten as "the light at the intersection of gurley and montezuma will turn green exactly three seconds after the light at the intersection of gurley and marina."