I checked my bags then got on the plane. SO A choppy sentence Sentence fragment Run-on sentence Comma splice what type of sentence is this

The awsner should be : b

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."

If you have a watch then make a small paragraph and just read slowly but don't make it to small or else you have to read really slow and people will start to notice