what about when you point the camera for lateral angle, and you are driving at 100 Km/h or 120 km/h. ?
in this case, you can take a photo each second (with a super fast exposure) and get a interval of 27~33 meters.
I get a problem when I tried to reduce this photo distance, taking more photos into the same second time because my goPro not save milliseconds into exif information :(.
did you thought about this problem before?